Additional Data related to an Emergency Call
draft-ietf-ecrit-additional-data-17

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ECRIT                                                           B. Rosen
Internet-Draft                                                   NeuStar
Intended status: Standards Track                           H. Tschofenig
Expires: July 26, 2014                      Nokia Solutions and Networks
                                                             R. Marshall
                                         TeleCommunication Systems, Inc.
                                                              R. Gellens
                                             Qualcomm Technologies, Inc.
                                                         J. Winterbottom

                                                        January 22, 2014

              Additional Data related to an Emergency Call
                draft-ietf-ecrit-additional-data-17.txt

Abstract

   When an emergency call is sent to a Public Safety Answering Point
   (PSAP), the device that sends it, as well as any application service
   provider in the path of the call, or access network provider through
   which the call originated may have information about the call, the
   caller or the location which the PSAP may be able to use.  This
   document describes data structures and a mechanism to convey such
   data to the PSAP.  The mechanism uses a Uniform Resource Identifier
   (URI), which may point to either an external resource or an object in
   the body of the SIP message.  The mechanism thus allows the data to
   be passed by reference (when the URI points to an external resource)
   or by value (when it points into the body of the message).  This
   follows the tradition of prior emergency services standardization
   work where data can be conveyed by value within the call signaling
   (i.e., in body of the SIP message) and also by reference.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

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   This Internet-Draft will expire on July 26, 2014.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Data Structures . . . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Data Provider Information . . . . . . . . . . . . . . . .   7
       3.1.1.  Data Provider String  . . . . . . . . . . . . . . . .   8
       3.1.2.  Data Provider ID  . . . . . . . . . . . . . . . . . .   8
       3.1.3.  Data Provider ID Series . . . . . . . . . . . . . . .   8
       3.1.4.  Type of Data Provider . . . . . . . . . . . . . . . .   9
       3.1.5.  Data Provider Contact URI . . . . . . . . . . . . . .  10
       3.1.6.  Data Provider Languages(s) Supported  . . . . . . . .  10
       3.1.7.  xCard of Data Provider  . . . . . . . . . . . . . . .  11
       3.1.8.  Subcontractor Principal . . . . . . . . . . . . . . .  11
       3.1.9.  Subcontractor Priority  . . . . . . . . . . . . . . .  12
       3.1.10. ProviderInfo Example  . . . . . . . . . . . . . . . .  12
     3.2.  Service Information . . . . . . . . . . . . . . . . . . .  14
       3.2.1.  Service Environment . . . . . . . . . . . . . . . . .  15
       3.2.2.  Service Delivered by Provider to End User . . . . . .  15
       3.2.3.  Service Mobility Environment  . . . . . . . . . . . .  17
       3.2.4.  emergencyCallData.ServiceInfo Example . . . . . . . .  17
     3.3.  Device Information  . . . . . . . . . . . . . . . . . . .  17
       3.3.1.  Device Classification . . . . . . . . . . . . . . . .  18
       3.3.2.  Device Manufacturer . . . . . . . . . . . . . . . . .  19
       3.3.3.  Device Model Number . . . . . . . . . . . . . . . . .  19
       3.3.4.  Unique Device Identifier  . . . . . . . . . . . . . .  20
       3.3.5.  Type of Device Identifier . . . . . . . . . . . . . .  20
       3.3.6.  Device/Service Specific Additional Data Structure . .  21
       3.3.7.  Device/Service Specific Additional Data Structure
               Type  . . . . . . . . . . . . . . . . . . . . . . . .  21
       3.3.8.  Issues with getting new types of data into use  . . .  22

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       3.3.9.  Choosing between defining a new type of block or new
               type of device/service specific additional data . . .  23
       3.3.10. emergencyCallData.DeviceInfo Example  . . . . . . . .  23
     3.4.  Owner/Subscriber Information  . . . . . . . . . . . . . .  24
       3.4.1.  Subscriber Data Privacy Indicator . . . . . . . . . .  24
       3.4.2.  xCard for Subscriber's Data . . . . . . . . . . . . .  25
       3.4.3.  emergencyCallData.SubscriberInfo Example  . . . . . .  25
     3.5.  Comment . . . . . . . . . . . . . . . . . . . . . . . . .  27
       3.5.1.  Comment . . . . . . . . . . . . . . . . . . . . . . .  27
       3.5.2.  emergencyCallData.Comment Example . . . . . . . . . .  28
   4.  Transport . . . . . . . . . . . . . . . . . . . . . . . . . .  28
     4.1.  Transmitting Blocks using the Call-Info Header  . . . . .  30
     4.2.  Transmitting Blocks by Reference using the Provided-By
           Element . . . . . . . . . . . . . . . . . . . . . . . . .  31
     4.3.  Transmitting Blocks by Value using the Provided-By
           Element . . . . . . . . . . . . . . . . . . . . . . . . .  32
     4.4.  The Content-Disposition Parameter . . . . . . . . . . . .  33
   5.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .  34
   6.  XML Schemas . . . . . . . . . . . . . . . . . . . . . . . . .  45
     6.1.  emergencyCallData.ProviderInfo XML Schema . . . . . . . .  45
     6.2.  emergencyCallData.ServiceInfo XML Schema  . . . . . . . .  46
     6.3.  emergencyCallData.DeviceInfo XML Schema . . . . . . . . .  47
     6.4.  emergencyCallData.SubscriberInfo XML Schema . . . . . . .  48
     6.5.  emergencyCallData.Comment XML Schema  . . . . . . . . . .  49
     6.6.  Provided-By XML Schema  . . . . . . . . . . . . . . . . .  50
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  52
   8.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  53
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  55
     9.1.  Registry creation . . . . . . . . . . . . . . . . . . . .  55
       9.1.1.  Provider ID Series Registry . . . . . . . . . . . . .  55
       9.1.2.  Service Environment Registry  . . . . . . . . . . . .  56
       9.1.3.  Service Provider Type Registry  . . . . . . . . . . .  57
       9.1.4.  Service Delivered Registry  . . . . . . . . . . . . .  57
       9.1.5.  Device Classification Registry  . . . . . . . . . . .  57
       9.1.6.  Device ID Type Type Registry  . . . . . . . . . . . .  58
       9.1.7.  Device/Service Data Type Registry . . . . . . . . . .  58
       9.1.8.  Additional Data Blocks Registry . . . . . . . . . . .  59
     9.2.  'emergencyCallData' Purpose Parameter Value . . . . . . .  59
     9.3.  URN Sub-Namespace Registration for provided-by Registry
           Entry . . . . . . . . . . . . . . . . . . . . . . . . . .  60
     9.4.  MIME Registrations  . . . . . . . . . . . . . . . . . . .  60
       9.4.1.  MIME Content-type Registration for
               'application/emergencyCallData.ProviderInfo+xml'  . .  60
       9.4.2.  MIME Content-type Registration for
               'application/emergencyCallData.ServiceInfo+xml' . . .  61
       9.4.3.  MIME Content-type Registration for
               'application/emergencyCallData.DeviceInfo+xml'  . . .  62
       9.4.4.  MIME Content-type Registration for

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               'application/emergencyCallData.SubscriberInfo+xml'  .  63
       9.4.5.  MIME Content-type Registration for
               'application/emergencyCallData.Comment+xml' . . . . .  64
     9.5.  URN Sub-Namespace Registration  . . . . . . . . . . . . .  65
       9.5.1.  Registration for
               urn:ietf:params:xml:ns:emergencycalldata  . . . . . .  65
       9.5.2.  Registration for
               urn:ietf:params:xml:ns:emergencycalldata:providerinfo  65
       9.5.3.  Registration for
               urn:ietf:params:xml:ns:emergencycalldata:ServiceInfo   66
       9.5.4.  Registration for
               urn:ietf:params:xml:ns:emergencycalldata:DeviceInfo .  67
       9.5.5.  Registration for
               urn:ietf:params:xml:ns:emergencycalldata:SubscriberIn
               fo  . . . . . . . . . . . . . . . . . . . . . . . . .  68
       9.5.6.  Registration for
               urn:ietf:params:xml:ns:emergencycalldata:comment  . .  68
     9.6.  Schema Registrations  . . . . . . . . . . . . . . . . . .  69
     9.7.  VCard Parameter Value Registration  . . . . . . . . . . .  70
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  70
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  70
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  70
     11.2.  Informational References . . . . . . . . . . . . . . . .  72
   Appendix A.  XML Schema for vCard/xCard . . . . . . . . . . . . .  73
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  95

1.  Introduction

   When an IP-based emergency call is initiated a rich set of data from
   multiple data sources is conveyed to the Public Safety Answering
   Point (PSAP).  This data includes information about the calling party
   identity, the multimedia capabilities of the device, the emergency
   service number, location information, and meta-data about the sources
   of the data.  The device, the access network provider, and any
   service provider in the call path may have even more information
   useful for a PSAP.  This document extends the basic set of data
   communicated with an IP-based emergency call, as described in
   [RFC6443] and [RFC6881], in order to carry additional data which may
   be useful to an entity or call taker handling the call.  This data is
   "additional" to the basic information found in the emergency call
   signaling used.

   In general, there are three categories of data communicated in an
   emergency call:

   Data Associated with a Location:  Location data is conveyed in the
      Presence Information Data Format Location Object (PIDF-LO) data
      structure originally defined in RFC 4119 [RFC4119] and extended by

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      RFC 5139 [RFC5139] and RFC 6848 [RFC6848] (for civic location
      information), RFC 5491 [RFC5491] and RFC 5962 [RFC5962] (for
      geodetic location information), and
      [I-D.ietf-geopriv-relative-location] (for relative location).
      There may be data that is specific to the location not available
      in the location data structure itself, such as floor plans, tenant
      and building owner contact data, heating, ventilation and air
      conditioning (HVAC) status, etc.

   Data Associated with a Call:  While information is carried in the
      call setup procedure itself (as part of the SIP headers as well as
      in the body of the SIP message), there is additional data known by
      the device making the call, and the service provider along the
      path of the call.  This information may include the service
      provider contact information, subscriber identity and contact
      information, the type of service the service provider and the
      access network provider offer, what kind of device is being used,
      etc.  Some data is device or service dependent data.  For example,
      a car telematics system may have crash information.  A medical
      monitoring device may have sensor data.

   Data Associated with a Caller:  This is personal data about a caller,
      such as medical information and emergency contact data.

   This document only defines data structures relevant to data
   associated with the call but defines extension points for other data
   to be added via other specifications.

   For interoperability, there needs to be a common way for the
   information conveyed to a PSAP to be encoded and identified.
   Identification allows emergency services authorities to know during
   call processing which types of data are present and to determine if
   they wish to access it.  A common encoding allows the data to be
   accessed.

   This document defines the data structures and a way to communicate
   the information in several ways.  Although current standardization
   efforts around IP-based emergency services are focused on the Session
   Initiation Protocol (SIP) and HTTP the data structures in XML format
   described in this document are usable for other communication systems
   as well.  In Section 3 the data structures are defined and the SIP/
   HTTP transport components are defined in Section 4 to offer a clear
   separation between the two.

   More technically, the data structure described in this document is
   represented as one or more "blocks" of information.  Each of the
   blocks is an XML structure with an associated Multipurpose Internet
   Mail Extensions (MIME) type for encapsulation, and an extensible set

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   of these types constitute the data set.  A registry is defined to
   list the block types that may be included.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

   This document also uses terminology from [RFC5012].  We use the term
   service provider to refer to an Application Service Provider (ASP).
   A Voice Service Provider (VSP) is a special type of ASP.  With the
   term "Access Network Provider" we refer to the Internet Access
   Provider (IAP) and the Internet Service Provider (ISP) without
   further distinguishing these two entities, since the difference
   between the two is not relevant for this document.  Note that the
   roles of ASP and access network provider may be provided by a single
   company.

   In the data block definitions, see Section 3, the values for the
   "Use:" label are specified as one of:

   'Required':  means they MUST be present in the data structure.

   'Conditional':  means they MUST be present if the specified
      condition(s) is met.  They MAY be present if the condition(s) is
      not met.

   'Optional':  means they MAY be present.

   vCard is a data format for representing and exchanging a variety of
   information about individuals and other entities.  For applications
   that use XML the format defined in vCard is not immediately
   applicable.  For this purpose an XML-based encoding of the
   information elements defined in the vCard specification has been
   defined and the name of that specification is xCard.  Since the term
   vCard is more familiar to most readers we use the term xCard and
   vCard interchangeable but it would be accurate to use the term vCard
   only.

3.  Data Structures

   This section defines the following five data structures, each as a
   data block.  For each block we define the MIME type, and the XML data
   structure.  The five data structures are:

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   'Data Provider':  This block supplies name and contact information
      for the entity that created the data.  Section 3.1 provides the
      details.

   'Service Information':  This block supplies information about the
      service.  The description can be found in Section 3.2.

   'Device Information':  This block supplies information about the
      device placing the call.  Device information can be found in
      Section 3.3.

   'Owner/Subscriber':  This block supplies information about the owner
      of the device or about the subscriber.  Details can be found in
      Section 3.4.

   'Comment':  This block provides a way to supply free form human
      readable text to the PSAP or emergency responders.  This simple
      structure is defined in Section 3.5.

   Each block contains a mandatory <id> element.  The purpose of this
   <id> element is to associate the data added by a data provider to the
   data provider block.  Consequently, when a data provider adds
   additional data to an emergency call (such as device information) it
   MUST add information about itself (via the data provider block) and
   the two blocks contain the same value in the <id> element, whereby
   the chosen value for the <id> element MUST be different to any other
   <id> elements already added by other data providers.

   Note that the xCard format is re-used in some of the data structures
   to provide contact information.  In an xCard there is no way to
   specify a "main" telephone number.  These numbers are useful to
   emergency responders who are called to a large enterprise.  This
   document adds a new property value to the "tel" property of the TYPE
   parameter called "main".  It can be used in any xCard in additional
   data.

3.1.  Data Provider Information

   This block is intended to be provided by any service provider in the
   path of the call or the access network provider.  It includes
   identification and contact information.  This block SHOULD be
   provided by every service provider in the call path, and by the
   access network provider.  Devices MAY use this block to provide
   identifying information.  The MIME subtype is "application/
   emergencyCall.ProviderInfo+xml".  An access network provider SHOULD
   provide this block either by value or by reference in the Provided-By
   section of a PIDF-LO

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3.1.1.  Data Provider String

   Data Element:  Data Provider String

   Use:  Required

   XML Element:  <DataProviderString>

   Description:  This is a plain language string suitable for displaying
      the name of the service provider that created the additional data
      structure.  If the device created the structure the value is
      identical to the contact header in the SIP INVITE.

   Reason for Need:  Inform the call taker of the identity of the entity
      providing the additional call data structure.

   How Used by Call Taker:  Allows the call taker to interpret the data
      in this structure.  The source of the information often influences
      how the information is used, believed or verified.

3.1.2.  Data Provider ID

   Data Element:  Data Provider ID

   Use:  Conditional.  This data SHOULD be provided if the service
      provider or access provider is located in a jurisdiction that
      maintains such ids.  For example, in North America, this would be
      a "NENA Company ID".

   XML Element:  <ProviderID>

   Description:  A jurisdiction specific code for the access provider or
      service provider shown in the <DataProvidedBy> element that
      created the structure of the call.  NOTE: In the US, the NENA
      Company ID must appear here.  Additional information can be found
      at http://www.nena.org/nena-company-id.  The NENA Company ID MUST
      be in the form of a URI in the following format:
      urn:nena:companyid:<NENA Company ID>

   Reason for Need:  Inform the call taker of the identity of the entity
      providing the additional call data structure.

   How Used by Call Taker:  Where jurisdictions have lists of providers
      the Data Provider ID provides useful information about the data
      source.

3.1.3.  Data Provider ID Series

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   Data Element:  Data Provider ID Series

   Use:  Conditional.  If Data Provider ID is provided, Data Provider ID
      Series is required.

   XML Element:  <ProviderIDSeries>

   Description:  Identifies the issuer of the ProviderId.  A registry
      will reflect the following valid entries:

      *  NENA

      *  EENA

   Reason for Need:  Identifies how to interpret the Data Provider ID.

   How Used by Call Taker:  Determines which provider ID registry to
      consult for more information

3.1.4.  Type of Data Provider

   Data Element:  Type of Data Provider ID

   Use:  Conditional.  If Data Provider ID is provided, Type of Data
      Provider ID is required.

   XML Element:  <TypeOfProviderID>

   Description:  Identifies the type of data provider id being supplied
      in the ProviderId data element.  A registry with an initial set of
      values is shown in Figure 1.

   +------------------------------+------------------------------------+
   | Token                        | Description                        |
   +------------------------------+------------------------------------+
   |Access Network Provider       | Access network service provider    |
   |Service Provider              | Calling or Origination telecom SP  |
   |Subcontractor                 | A contractor to another SP |
   |Telematics Provider           | A sensor based SP, especially      |
   |                              | vehicle based                      |
   |Language Translation Provider | A spoken language translation SP   |
   |Emergency Service Provider    | An emergency service provider      |
   |                              | conveying information to another   |
   |                              | emergency service provider.        |
   |Emergency Modality Translation| An emergency call specific         |
   |                              | modality translation service       |
   |                              | e.g., for sign language            |
   |Relay Provider                | A interpretation SP, for example,  |

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   |                              | video relay for sign language      |
   |                              | interpreting                       |
   |Other                         | Any other type of service provider |
   +------------------------------+------------------------------------+

               Figure 1: Type of Data Provider ID Registry.

   Reason for Need:  Identifies what kind of data provider this is.

   How Used by Call Taker:  To decide who to contact when further
      information is needed

3.1.5.  Data Provider Contact URI

   Data Element:  Data Provider Contact URI

   Use:  Required

   XML Element:  <ContactURI>

   Description:  When provided by a service provider or an access
      provider, this information MUST be a URI to a 24/7 support
      organization tasked to provide PSAP support for this emergency
      call.  If the call is from a device, this would reflect the
      contact information of the owner of the device.  If a telephone
      number is the contact address then it MUST be tel URI.  If it is
      provided as a SIP URI then it MUST be in the form of
      sip:telephonenumber@serviceprovider:user=phone.  Note that this
      contact information is not used by PSAPs for callbacks using a SIP
      Priority header field with the value set to "psap- callback", as
      described in [I-D.ietf-ecrit-psap-callback].

   Reason for Need:  Additional data providers may need to be contacted
      for error or other unusual circumstances.

   How Used by Call Taker:  To contact the supplier of the additional
      data for assistance in handling the call.

3.1.6.  Data Provider Languages(s) Supported

   Data Element:  Data Provider Language(s) supported

   Use:  Required.

   XML Element:  <Language>

   Description:  The language used by the entity at the Data Provider
      Contact URI as an alpha 2-character code as defined in ISO

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      639-1:2002 Codes for the representation of names of languages --
      Part 1: Alpha-2 code Multiple instances of this element may occur.
      Order is significant; preferred language should appear first.  The
      content MUST reflect the languages supported at the contact URI.

      Note that the 'language' media feature tag, defined in RFC 3840
      [RFC3840] and the more extensive language negotiation mechanism
      proposed with [I-D.gellens-negotiating-human-language] are
      independent of this data provider language indication.

   Reason for Need:  Information needed to determine if emergency
      service authority can communicate with the service provider or if
      an interpreter will be needed.

   How Used by Call Taker:  If call taker cannot speak language(s)
      supported by the service provider, a translation service will need
      to be added to the conversation.  Alternatively, other persons at
      the PSAP, besides the call taker, might be consulted for help
      (depending on the urgency and the type of interaction).

3.1.7.  xCard of Data Provider

   Data Element:  xCard of Data Provider

   Use:  Optional

   XML Element:  <DataProviderContact>

   Description:  There are many fields in the xCard and the creator of
      the data structure is encouraged to provide as much information as
      they have available.  N, ORG, ADR, TEL, EMAIL are suggested at a
      minimum.  N should contain name of support group or device owner
      as appropriate.  If more than one TEL property is provided, a
      parameter from the vCard Property Value registry MUST be specified
      on each TEL.  For encoding of the xCard this specification uses
      the XML-based encoding specified in [RFC6351]. and is hereinafter
      referred to as "xCard"

   Reason for Need:  Information needed to determine additional contact
      information.

   How Used by Call Taker:  Assists call taker by providing additional
      contact information that may not be included in the SIP invite or
      the PIDF-LO.

3.1.8.  Subcontractor Principal

   Data Element:  Subcontractor Principal

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   Use:  Conditional.  This data is required if the Data Provider type
      is subcontractor.

   XML Element:  <SubcontratorPrincipal>

   Description:  Some providers outsource their obligations to handle
      aspects of emergency services to specialized providers.  If the
      data provider is a subcontractor to another provider this element
      contains the DataProviderString of the service provider to
      indicate which provider the subcontractor is working for.

   Reason for Need:  Identify the entity the subcontractor works for.

   How Used by Call Taker:  Allows the call taker to understand what the
      relationship between data providers and the service providers in
      the path of the call are.

3.1.9.  Subcontractor Priority

   Data Element:  Subcontractor Priority

   Use:  Conditional.  This element is required if the Data Provider
      type is set to "Subcontractor".

   XML Element:  <SubcontractorPriority>

   Description:  If the subcontractor has to be contacted first then
      this element MUST have the value "sub".  If the provider the
      subcontractor is working for has to be contacted first then this
      element MUST have the value "main".

   Reason for Need:  Inform the call taker whom to contact first, if
      support is needed.

   How Used by Call Taker:  To decide which entity to contact first if
      assistance is needed.

3.1.10.  ProviderInfo Example

   <?xml version="1.0" encoding="UTF-8"?>
   <ad:emergencyCallData.ProviderInfo
       xmlns:ad="urn:ietf:params:xml:ns:emergencycalldata:providerinfo"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
           <ad:id>12345</ad:id>
       <ad:DataProviderString>Example VoIP Provider
         </ad:DataProviderString>
       <ad:ProviderID>urn:nena:companyid:ID123</ad:ProviderID>

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       <ad:ProviderIDSeries>NENA</ad:ProviderIDSeries>
       <ad:TypeOfProvider>Service Provider</ad:TypeOfProvider>
       <ad:ContactURI>sip:voip-provider@example.com</ad:ContactURI>
       <ad:Language>EN</ad:Language>
       <ad:DataProviderContact
           xmlns="urn:ietf:params:xml:ns:vcard-4.0">
                   <vcard>
                       <fn><text>Hannes Tschofenig</text></fn>
                       <n>
                           <surname>Hannes</surname>
                           <given>Tschofenig</given>
                           <additional/>
                           <prefix/>
                           <suffix>Dipl. Ing.</suffix>
                       </n>
                       <bday><date>--0203</date></bday>
                       <anniversary>
                           <date-time>20090808T1430-0500</date-time>
                       </anniversary>
                       <gender><sex>M</sex></gender>
                       <lang>
                           <parameters><pref><integer>1</integer></pref>
                           </parameters>
                           <language-tag>de</language-tag>
                       </lang>
                       <lang>
                           <parameters><pref><integer>2</integer></pref>
                           </parameters>
                           <language-tag>en</language-tag>
                       </lang>
                       <org>
                           <parameters><type><text>work</text></type>
                           </parameters>
                           <text>Example VoIP Provider</text>
                       </org>
                       <adr>
                           <parameters>
                               <type><text>work</text></type>
                               <label><text>Hannes Tschofenig
                                   Linnoitustie 6
                                   Espoo , Finland
                                   02600</text></label>
                           </parameters>
                           <pobox/>
                           <ext/>
                           <street>Linnoitustie 6</street>
                           <locality>Espoo</locality>
                           <region>Uusimaa</region>

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                           <code>02600</code>
                           <country>Finland</country>
                       </adr>
                       <tel>
                           <parameters>
                               <type>
                                   <text>work</text>
                                   <text>voice</text>
                               </type>
                           </parameters>
                           <uri>tel:+358 50 4871445</uri>
                       </tel>
                       <email>
                           <parameters><type><text>work</text></type>
                           </parameters>
                           <text>hannes.tschofenig@nsn.com</text>
                       </email>
                       <geo>
                           <parameters><type><text>work</text></type>
                           </parameters>
                           <uri>geo:60.210796,24.812924</uri>
                       </geo>
                       <key>
                           <parameters><type><text>home</text></type>
                           </parameters>
                           <uri>
                           http://www.tschofenig.priv.at/key.asc
                           </uri>
                       </key>
                       <tz><text>Finland/Helsinki</text></tz>
                       <url>
                           <parameters><type><text>home</text></type>
                           </parameters>
                           <uri>http://www.tschofenig.priv.at</uri>
                       </url>
                   </vcard>
       </ad:DataProviderContact>
   </ad:emergencyCallData.ProviderInfo>

               Figure 2: emergencyCall.ProviderInfo Example.

3.2.  Service Information

   This block describes the service that the service provider provides
   to the caller.  It SHOULD be included by all SPs in the path of the
   call.  The mime subtype is "application/
   emergencyCall.ServiceInfo+xml".

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3.2.1.  Service Environment

   Data Element:  Service Environment

   Use:  Required

   XML Element:  <SvcEnvironment>

   Description:  This element defines whether a call is from a business
      or residence caller.  Currently, the only valid entries are
      'Business' or 'Residence'.  New values can be defined via the
      registry created in Figure 22.

   Reason for Need:  To assist in determining equipment and manpower
      requirements.

   How Used by Call Taker:  Information may be used to assist in
      determining equipment and manpower requirements for emergency
      responders.  As the information is not always available, and the
      registry is not all encompassing, this is at best advisory
      information, but since it mimics a similar capability in some
      current emergency calling systems, it is known to be valuable.
      The service provider uses its best information (such as a rate
      plan, facilities used to deliver service or service description)
      to determine the information and is not responsible for
      determining the actual characteristics of the location where the
      call originates from.

3.2.2.  Service Delivered by Provider to End User

   Data Element:  Service Delivered by Provider to End User

   Use:  Required

   XML Element:  <SvcDelByProvider>

   Description:  This defines the type of service the end user has
      subscribed to.  The implied mobility of this service cannot be
      relied upon.  A registry with an initial set of values is defined
      in Figure 3.

   +--------+----------------------------------------+
   | Name   | Description                            |
   +--------+----------------------------------------+
   | Wrless | Wireless Telephone Service: Includes   |
   |        |   Satellite, CDMA, GSM, Wi-Fi, WiMAX,  |
   |        |   LTE (Long Term Evolution)            |
   | Coin   | Fixed Public Pay/Coin telephones: Any  |

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   |        |   coin or credit card operated device  |
   | 1way   | One way outbound service               |
   | Prison | Inmate call/service                    |
   | Temp   | Soft dialtone/quick service/warm       |
   |        |   disconnect/suspended                 |
   | MLTS   | Multi-line telephone system: Includes  |
   |        |   all PBX, Centrex, key systems,       |
   |        |   Shared Tenant Service                |
   | SenseU | Sensor, unattended: Includes devices   |
   |        |   that generate DATA ONLY. This is     |
   |        |   one-way information exchange and     |
   |        |   there will be no other form of       |
   |        |   communication                        |
   | SenseA | Sensor, attended: Includes devices     |
   |        |   that are supported by a monitoring   |
   |        |   service provider or automatically    |
   |        |   open a two-way communication path    |
   | POTS   | Wireline: Plain Old Telephone Service  |
   | VOIP   | VoIP Telephone Service: A type of      |
   |        |   service that offers communication    |
   |        |   over internet protocol, such as Fixed|
   |        |   Nomadic, Mobile, ...                 |
   | Remote | Off premise extension                  |
   | Relay  | Relay Service: a type of service where |
   |        |   there is a human 3rd party agent who |
   |        |   provides some kind of additional     |
   |        |   assistance to the caller.  Includes  |
   |        |   sign language relay and telematics   |
   |        |   services which provide a service     |
   |        |   assistant on the call.               |
   +--------+----------------------------------------+

       Figure 3: Service Delivered by Provider to End User Registry.

      More than one value MAY be returned.  For example, a VoIP inmate
      telephone service is a reasonable combination.

   Reason for Need:  Knowing the type of service may assist the PSAP
      with the handling of the call.

   How Used by Call Taker:  Call takers often use this information to
      determine what kinds of questions to ask callers, and how much to
      rely on supportive information.  An emergency call from a prison
      is treated differently that a call from a sensor device.  As the
      information is not always available, and the registry is not all
      encompassing, this is at best advisory information, but since it
      mimics a similar capability in some current emergency calling
      systems, it is known to be valuable.

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3.2.3.  Service Mobility Environment

   Data Element:  Service Mobility Environment

   Use:  Required

   XML Element:  <SvcMobility>

   Description:  This provides the service providers view of the
      mobility of the caller.  As the service provider may not know the
      characteristics of the actual access network used, the value not
      be relied upon.  A registry will reflect the following initial
      valid entries:

      *  Mobile: the device should be able to move at any time

      *  Fixed: the device is not expected to move unless the service is
         relocated

      *  Nomadic: the device is not expected to change its point of
         attachment while on a call

      *  Unknown: no information is known about the service mobility
         environment for the device

   Reason for Need:  Knowing the service provider's belief of mobility
      may assist the PSAP with the handling of the call.

   How Used by Call Taker:  To determine whether to assume the location
      of the caller might change.

3.2.4.  emergencyCallData.ServiceInfo Example

   <?xml version="1.0" encoding="UTF-8"?>
   <svc:emergencyCallData.ServiceInfo
        xmlns:svc="urn:ietf:params:xml:ns:emergencyCall.ServiceInfo"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
       <svc:id>12345</svc:id>
       <svc:SvcEnvironment>Business</svc:SvcEnvironment>
       <svc:SvcDelByProvider>MLTS</svc:SvcDelByProvider>
       <svc:SvcMobility>Fixed</svc:SvcMobility>
   </svc:emergencyCallData.ServiceInfo>

             Figure 4: emergencyCallData.ServiceInfo Example.

3.3.  Device Information

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   This block provides information about the device used to place the
   call.  It should be provided by any service provider that knows what
   device is being used, and by the device itself.  The mime subtype is
   "application/emergencyCall.DeviceInfo+xml".

3.3.1.  Device Classification

   Data Element:  Device Classification

   Use:  Optional

   XML Element:  <DeviceClassification>

   Description:  This data element defines the kind of device making the
      emergency call.  If the device provides the data structure, the
      device information SHOULD be provided.  If the service provider
      provides the structure and it knows what the device is, the
      service provider SHOULD provide the device information.  Often the
      carrier does not know what the device is.  It is possible to
      receive two Additional Data Associated with a Call data
      structures, one created by the device and one created by the
      service provider.  This information describes the device, not how
      it is being used.  This data element defines the kind of device
      making the emergency call.  The registry with the initial set of
      values is shown in Figure 5.

   +--------+----------------------------------------+
   | Token  | Description                            |
   +--------+----------------------------------------+
   |Cordless| Cordless handset                       |
   | Fixed  | Fixed phone                            |
   | Mobile | Mobile handset                         |
   | ATA    | analog terminal adapter                |
   |Satphone| Satellite phone                        |
   | FSense | Stationary computing device (alarm     |
   |        |   system, data sensor)                 |
   | Guard  | Guardian devices                       |
   | Desktop| Desktop PC                             |
   | Laptop | Laptop computing device                |
   | Tablet | Tablet computing device                |
   | Alarm  | Alarm system                           |
   | MSense | Mobile Data sensor                     |
   | Beacon | Personal beacons (spot)                |
   | Auto   | Auto telematics                        |
   | Truck  | Truck telematics                       |
   | Farm   | Farm equipment telematics              |
   | Marine | Marine telematics                      |
   | PDA    | Personal digital assistant             |

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   | PND    | Personal navigation device)            |
   | SmrtPhn| Smart phone                            |
   | Itab   | Internet tablet                        |
   | Game   | Gaming console                         |
   | Video  | Video phone                            |
   | Text   | Other text device                      |
   |SoftPhn | Soft phone or soft client software     |
   | NA     | Not Available                          |
   +--------+----------------------------------------+

                 Figure 5: Device Classification Registry.

   Reason for Need:  The device classification implies the capability of
      the calling device and assists in identifying the meaning of the
      emergency call location information that is being presented.  For
      example, does the device require human intervention to initiate a
      call or is this call the result of programmed instructions?  Does
      the calling device have the ability to update location or
      condition changes?  Is this device interactive or a one-way
      reporting device?

   How Used by Call Taker:  May assist with location of caller.  For
      example, a cordless handset may be outside or next door.  May
      provide the calltaker some context about the caller, the
      capabilities of the device used for the call or the environment
      the device is being used in.

3.3.2.  Device Manufacturer

   Data Element:  Device Manufacturer

   Use:  Optional

   XML Element:  <DeviceMfgr>

   Description:  The plain language name of the manufacturer of the
      device.

   Reason for Need:  Used by PSAP management for post-mortem
      investigation/resolution.

   How Used by Call Taker:  Probably not used by the calltaker, but by
      PSAP management.

3.3.3.  Device Model Number

   Data Element:  Device Model Number

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   Use:  Optional

   XML Element:  <DeviceModelNr>

   Description:  Model number of the device.

   Reason for Need:  Used by PSAP management for after action
      investigation/resolution.

   How Used by Call Taker:  Probably not used by the calltaker, but by
      PSAP management.

3.3.4.  Unique Device Identifier

   Data Element:  Unique Device Identifier

   Use:  Optional

   XML Element:  <UniqueDeviceID>

   Description:  String that identifies the specific device making the
      call or creating an event.

   Reason for Need:  Uniquely identifies the device as opposed to any
      signaling identifiers encountered in the call signaling stream.

   How Used by Call Taker:  Probably not used by the calltaker; they
      would need to refer to management for investigation.

3.3.5.  Type of Device Identifier

   Data Element:  Type of Device Identifier

   Use:  Conditional: must be provided if the DeviceID is provided

   XML Element:  <TypeOfDeviceID>

   Description:  Identifies the type of device identifier being
      generated in the unique device identifier data element.  A
      registry with an initial set of values can be seen in Figure 6.

   +--------+----------------------------------------+
   | Token  | Description                            |
   +--------+----------------------------------------+
   | MEID   | Mobile Equipment Identifier  (CDMA)    |
   | ESN    | Electronic Serial Number(GSM)          |
   | MAC    | Media Access Control Address (IEEE)    |
   | WiMAX  | Device Certificate Unique ID           |

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   | IMEI   | International Mobile Equipment ID (GSM)|
   | UDI    | Unique Device Identifier               |
   | RFID   | Radio Frequency Identification         |
   | SN     | Manufacturer Serial Number             |
   +--------+----------------------------------------+

             Figure 6: Registry with Device Identifier Types.

   Reason for Need:  Identifies how to interpret the Unique Device
      Identifier.

   How Used by Call Taker:  Additional information that may be used to
      assist with call handling.

3.3.6.  Device/Service Specific Additional Data Structure

   Data Element:  Device/service specific additional data structure

   Use:  Optional

   XML Element:  <DeviceSpecificData>

   Description:  A URI representing additional data whose schema is
      specific to the device or service which created it.  An example is
      the Vehicular Emergency Data Set (VEDS) structure for a vehicle
      telematics device.  The URI, when dereferenced, MUST yield a data
      structure defined by the Device/service specific additional data
      type value.  Different data may be created by each classification;
      e.g., a telematics created VEDS data set.

   Reason for Need:  Provides device/service specific data that may be
      used by the call taker and/or responders.

   How Used by Call Taker:  Provide information to guide call takers to
      select appropriate responders, give appropriate pre-arrival
      instructions to callers, and advise responders of what to be
      prepared for.  May be used by responders to guide assistance
      provided.

3.3.7.  Device/Service Specific Additional Data Structure Type

   Data Element:  Type of device/service specific additional data
      structure

   Use:  Conditional.  MUST be provided when device/service specific
      additional URI is provided

   XML Element:  <DeviceSpecificType>

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   Description:  Value from a registry defined by this document to
      describe the type of data that can be retrieved from the device/
      service specific additional data structure.  Initial values are:

      *  IEEE 1512

      *  VEDS

      IEEE 1512 is the USDoT model for traffic incidents and VEDS
      provides data elements needed for an efficient emergency response
      to vehicular emergency incidents.

   Reason for Need:  This data element allows identification of
      externally defined schemas, which may have additional data that
      may assist in emergency response.

   How Used by Call Taker:  This data element allows the end user
      (calltaker or first responder) to know what type of additional
      data may be available to aid in providing the needed emergency
      services.

   Note:  Information which is specific to a location or a caller
      (person) should not be placed in this section.

3.3.8.  Issues with getting new types of data into use

   This document describes two mechanisms which allow extension of the
   kind of data provided with an emergency call: define a new block or
   define a new service specific additional data URL for the DeviceInfo
   block.  While defining new data types and getting a new device or
   application to send the new data may be easy, getting PSAPs and
   responders to actually retrieve the data and use it will be
   difficult.  New mechanism providers should understand that acquiring
   and using new forms of data usually require software upgrades at the
   PSAP and/or responders, as well as training of call takers and
   responders in how to interpret and use the information.  Legal and
   operational review may also be needed.  Overwhelming a call taker or
   responder with too much information is highly discouraged.  Thus, the
   barrier to supporting new data is quite high.

   The mechanisms this document describes are meant to encourage
   development of widely supported, common data formats for classes of
   devices.  If all manufacturers of a class of device use the same
   format, and the data can be shown to improve outcomes, then PSAPs and
   responders may be encouraged to upgrade their systems and train their
   staff to use the data.  Variations, however well intentioned, are
   unlikely to be supported.

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   Implementers should consider that data from sensor-based devices in
   some cases may not be useful to call takers or PSAPs (and privacy or
   other considerations may preclude the PSAP from touching the data),
   but may be of use to responders.  Some standards being developed by
   other organizations to carry data from the PSAP to responders are
   designed to carry all additional data supplied in the call that
   conform to this document, even if the PSAP does not fetch or
   interpret the data.  This allows responders to get the data even if
   the PSAP does not.

3.3.9.  Choosing between defining a new type of block or new type of
        device/service specific additional data

   For devices that have device or service specific data, there are two
   choices to carry it.  A new block can be defined, or the device/
   service specific additional data URL the DeviceInfo block can be used
   and a new type for it defined .  The data passed would likely be the
   same in both cases.  Considerations for choosing which mechanism to
   register under include:

   Applicability:  Information which will be carried by many kinds of
      devices or services are more appropriately defined as separate
      blocks.

   Privacy:  Information which may contain private data may be better
      sent in the DeviceInfo block, rather than a new block so that
      implementations are not tempted to send the data by value, and
      thus having more exposure to the data than forcing the data to be
      retrieved via the URL in DeviceInfo.

   Size:  Information which may be very may be better sent in the
      DeviceInfo block, rather than a new block so that implementations
      are not tempted to send the data by value.  Conversely, data which
      is small may best be sent in a separate block so that it can be
      sent by value

   Availability of a server:  Providing the data via the device block
      requires a server be made available to retrieve the data.
      Providing the data via new block allows it to be sent by value
      (CID).

3.3.10.  emergencyCallData.DeviceInfo Example

   <?xml version="1.0" encoding="UTF-8"?>
   <dev:emergencyCallData.DeviceInfo
        xmlns:dev="urn:ietf:params:xml:ns:emergencycalldata:DeviceInfo"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

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       <dev:id>12345</dev:id>
       <dev:DeviceClassification>Fixed phone</dev:DeviceClassification>
       <dev:DeviceMfgr>Nokia</dev:DeviceMfgr>
       <dev:DeviceModelNr>Lumia 800</dev:DeviceModelNr>
       <dev:UniqueDeviceID>35788104</dev:UniqueDeviceID>
       <dev:TypeOfDeviceID>IMEI</dev:TypeOfDeviceID>
   </dev:emergencyCallData.DeviceInfo>

              Figure 7: emergencyCallData.DeviceInfo Example.

3.4.  Owner/Subscriber Information

   This block describes the owner of the device (if provided by the
   device) or the subscriber information, if provided by a service
   provider.  The contact location is not necessarily the location of
   the caller or incident, but is rather the nominal contact address.
   The mime subtype is "application/emergencyCall.Subscriber+xml".

   In some jurisdictions some or all parts of the subscriber-specific
   information are subject to privacy constraints.  These constraints
   vary but dictate what information and be displayed and logged.  A
   general privacy indicator expressing a desire for privacy is
   provided.  The interpretation of how this is applied is left to the
   receiving jurisdiction as the custodians of the local regulatory
   requirements.

3.4.1.  Subscriber Data Privacy Indicator

   Attribute:  privacyRequested, boolean.

   Use:  Conditional.  This attribute MUST be provided if the owner/
      subscriber information block is not empty.

   Description:  The subscriber data privacy indicator specifically
      expresses the subscriber's desire for privacy.  In some
      jurisdictions subscriber services can have a specific "Type of
      Service" which prohibits information, such as the name of the
      subscriber, from being displayed.  This attribute should be used
      to explicitly indicate whether the subscriber service includes
      such constraints.

   Reason for Need:  Some jurisdictions require subscriber privacy to be
      observed.

   How Used by Call Taker:  Where privacy is indicated the call taker
      may not have access to some aspects of the subscriber information.

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3.4.2.  xCard for Subscriber's Data

   Data Element:  xCARD for Subscriber's Data

   Use:  Conditional.  Subscriber data is provided unless it is not
      available.  Some services, for example prepaid phones, non-
      initialized phones, etc., do not have information about the
      subscriber.

   XML Element:  <SubscriberData>

   Description:  Information known by the service provider or device
      about the subscriber; e.g., Name, Address, Individual Telephone
      Number, Main Telephone Number and any other data.  N, ORG (if
      appropriate), ADR, TEL, EMAIL are suggested at a minimum.  If more
      than one TEL property is provided, a parameter from the vCard
      Property Value registry MUST be specified on each TEL.

   Reason for Need:  When the caller is unable to provide information,
      this data may be used to obtain it

   How Used by Call Taker:  Obtaining critical information about the
      caller and possibly the location when it is not able to be
      obtained otherwise.

3.4.3.  emergencyCallData.SubscriberInfo Example

   <?xml version="1.0" encoding="UTF-8"?>
   <sub:emergencyCallData.SubscriberInfo
        xmlns:sub="urn:ietf:params:xml:ns:emergencycalldata:SubscriberInfo"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        privacyRequested="false">
       <sub:id>12345</sub:id>
       <sub:SubscriberData xmlns="urn:ietf:params:xml:ns:vcard-4.0">
           <vcards>
               <vcard>
                   <fn><text>Simon Perreault</text></fn>
                   <n>
                       <surname>Perreault</surname>
                       <given>Simon</given>
                       <additional/>
                       <prefix/>
                       <suffix>ing. jr</suffix>
                       <suffix>M.Sc.</suffix>
                   </n>
                   <bday><date>--0203</date></bday>
                   <anniversary>

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                       <date-time>20090808T1430-0500</date-time>
                   </anniversary>
                   <gender><sex>M</sex></gender>
                   <lang>
                       <parameters><pref><integer>1</integer></pref>
                       </parameters>
                       <language-tag>fr</language-tag>
                   </lang>
                   <lang>
                       <parameters><pref><integer>2</integer></pref>
                       </parameters>
                       <language-tag>en</language-tag>
                   </lang>
                   <org>
                       <parameters><type><text>work</text></type>
                       </parameters>
                       <text>Viagenie</text>
                   </org>
                   <adr>
                       <parameters>
                           <type><text>work</text></type>
                           <label><text>Simon Perreault
                               2875 boul. Laurier, suite D2-630
                               Quebec, QC, Canada
                               G1V 2M2</text></label>
                       </parameters>
                       <pobox/>
                       <ext/>
                       <street>2875 boul. Laurier, suite D2-630</street>
                       <locality>Quebec</locality>
                       <region>QC</region>
                       <code>G1V 2M2</code>
                       <country>Canada</country>
                   </adr>
                   <tel>
                       <parameters>
                           <type>
                               <text>work</text>
                               <text>voice</text>
                           </type>
                       </parameters>
                       <uri>tel:+1-418-656-9254;ext=102</uri>
                   </tel>
                   <tel>
                       <parameters>
                           <type>
                               <text>work</text>
                               <text>text</text>

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                               <text>voice</text>
                               <text>cell</text>
                               <text>video</text>
                           </type>
                       </parameters>
                       <uri>tel:+1-418-262-6501</uri>
                   </tel>
                   <email>
                       <parameters><type><text>work</text></type>
                       </parameters>
                       <text>simon.perreault@viagenie.ca</text>
                   </email>
                   <geo>
                       <parameters><type><text>work</text></type>
                       </parameters>
                       <uri>geo:46.766336,-71.28955</uri>
                   </geo>
                   <key>
                       <parameters><type><text>work</text></type>
                       </parameters>
                       <uri>
                       http://www.viagenie.ca/simon.perreault/simon.asc
                       </uri>
                   </key>
                   <tz><text>America/Montreal</text></tz>
                   <url>
                       <parameters><type><text>home</text></type>
                       </parameters>
                       <uri>http://nomis80.org</uri>
                   </url>
               </vcard>
           </vcards>
       </sub:SubscriberData>
   </sub:emergencyCallData.SubscriberInfo>

            Figure 8: emergencyCallData.SubscriberInfo Example.

3.5.  Comment

   This block provides a mechanism for the data provider to supply
   extra, human readable information to the PSAP.  It is not intended
   for a general purpose extension mechanism nor does it aim to provide
   machine-reable content.  The mime subtype is "application/
   emergencyCall.Comment+xml"

3.5.1.  Comment

   Data Element:  EmergencyCall.Comment

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   Use:  Optional

   XML Element:  <Comment>

   Description:  Human readable text providing additional information to
      the PSAP staff.

   Reason for Need:  Explanatory information for values in the data
      structure

   How Used by Call Taker:  To interpret the data provided

3.5.2.  emergencyCallData.Comment Example

   <?xml version="1.0" encoding="UTF-8"?>
   <com:emergencyCallData.Comment
        xmlns:sub="urn:ietf:params:xml:ns:emergencycalldata:comment"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
        <com:id>12345</com:id>
      <com:Comment xml:lang="en">This is an example text.</com:Comment>
   </com:emergencyCallData.Comment>

               Figure 9: EmergencyCallData.Comment Example.

4.  Transport

   This section defines how to convey additional data to an emergency
   service provider.  Two different means are specified: the first uses
   the call signaling; the second uses the <provided-by> element of a
   PIDF-LO [RFC4119].

   1.  First, the ability to embed a Uniform Resource Identifier (URI)
       in an existing SIP header field, the Call-Info header, is
       defined.  The URI points to the additional data structure.  The
       Call-Info header is specified in Section 20.9 of [RFC3261].  This
       document adds a new compound token starting with the value
       'emergencyCallData' for the Call-Info "purpose" parameter.  If
       the "purpose" parameter is set to a value starting with
       'emergencyCallData', then the Call-Info header contains either an
       HTTPS URL pointing to an external resource or a CID (content
       indirection) URI that allows the data structure to be placed in
       the body of the SIP message.  The "purpose" parameter also
       indicates the kind of data (by its MIME type) that is available
       at the URI.  As the data is conveyed using a URI in the SIP
       signaling, the data itself may reside on an external resource, or
       may be contained within the body of the SIP message.  When the
       URI refers to data at an external resource, the data is said to

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       be passed by reference.  When the URI refers to data contained
       within the body of the SIP message, the data is said to be passed
       by value.  A PSAP or emergency responder is able to examine the
       type of data provided and selectively inspect the data it is
       interested in, while forwarding all of it (the values or
       references) to downstream entities.  To be conveyed in a SIP
       body, additional data about a call is defined as a series of MIME
       objects.  Each block defined in this document is an XML data
       structure identified by its MIME type.  (Blocks defined by others
       may be encoded in XML or not, as identified by their MIME
       registration.)  As usual, whenever more than one MIME part is
       included in the body of a message, MIME-multipart (i.e.,
       'multipart/mixed') encloses them all.  This document defines a
       set of XML schemas and MIME types used for each block defined
       here.  When additional data is passed by value in the SIP
       signaling, each CID URL points to one block in the body.
       Multiple URIs are used within a Call-Info header field (or
       multiple Call-Info header fields) to point to multiple blocks.
       When additional data is provided by reference (in SIP signaling
       or Provided-By), each HTTPS URL references one block; the data is
       retrieved with an HTTPS GET operation, which returns one of the
       blocks as an object (the blocks defined here are returned as XML
       objects).

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   2.  Second, the ability to embed additional data structures in the
       <provided-by> element of a PIDF-LO [RFC4119] is defined.  Besides
       a service provider in the call path, the access network provider
       may also have similar information that may be valuable to the
       PSAP.  The access network provider may provide location in the
       form of a PIDF-LO from a location server via a location
       configuration protocol.  The data structures described in this
       document are not specific to the location itself, but rather
       provides descriptive information having to do with the immediate
       circumstances about the provision of the location (who the access
       network is, how to contact that entity, what kind of service the
       access network provides, subscriber information, etc.).  This
       data is similar in nearly every respect to the data known by
       service providers in the path of the call.  When the access
       network provider and service provider are separate entities, the
       access network does not participate in the application layer
       signaling (and hence cannot add a Call-Info header field to the
       SIP message), but may provide location information to assist in
       locating the caller's device.  The <provided-by> element of the
       PIDF-LO is a mechanism for the access network provider to supply
       the information about the entity or organization that supplied
       this location information.  For this reason, this document
       describes a namespace per RFC 4119 for inclusion in the
       <provided-by> element of a PIDF-LO for adding information known
       to the access network provider.

   One or more blocks of data registered in the Emergency Call
   Additional Data registry, as defined in Section 9.1, may be included
   or referenced in the SIP signaling (using the Call-Info header field)
   or in the <provided-by> element of a PIDF-LO.  Every block must be
   one of the types in the registry.  Since the data of an emergency
   call may come from multiple sources, the data itself needs
   information describing the source.  Consequently, each entity adding
   additional data MUST supply the "Data Provider" block.  All other
   blocks are optional, but each entity SHOULD supply any blocks where
   it has at least some of the information in the block.

4.1.  Transmitting Blocks using the Call-Info Header

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   A URI to a block MAY be inserted in a SIP request or response method
   (most often INVITE or MESSAGE) with a Call-Info header field
   containing a purpose value starting with 'emergencyCallData' and the
   type of data available at the URI.  The type of data is denoted by
   including the root of the MIME type (not including the
   'emergencyCall' prefix and any suffix such as '+xml') with a '.'
   separator.  For example, when referencing a block with MIME type
   'application/emergencyCall.ProviderInfo+xml', the 'purpose' parameter
   is set to 'emergencyCallData.ProviderInfo'.  An example "Call-Info"
   header field for this would be:

   Call-Info:  https://www.example.com/23sedde3;
       purpose="emergencyCallData.ProviderInfo"

   A Call-info header with a purpose value starting with
   'emergencyCallData' MUST only be sent on an emergency call, which can
   be ascertained by the presence of an emergency service urn in a Route
   header of a SIP message.

   If the data is provided by reference, an HTTPS URI MUST be included
   and consequently Transport Layer Security (TLS) protection is applied
   for protecting the retrieval of the information.

   The data may also be supplied by value in a SIP message.  In this
   case, Content Indirection (CID) [RFC2392] is used, with the CID URL
   referencing the MIME body part.

   More than one Call-Info header with a purpose value starting with
   'emergencyCallData' can be expected, but at least one MUST be
   provided.  The device MUST provide one if it knows no service
   provider is in the path of the call.  The device MAY insert one if it
   uses a service provider.  Any service provider in the path of the
   call MUST insert its own.  For example, a device, a telematics
   service provider in the call path, as well as the mobile carrier
   handling the call will each provide one.  There may be circumstances
   where there is a service provider who is unaware that the call is an
   emergency call and cannot reasonably be expected to determine that it
   is an emergency call.  In that case, that service provider is not
   expected to provide emergencyCallData.

4.2.  Transmitting Blocks by Reference using the Provided-By Element

   The 'emergencyCallDataReference' element is used to transmit an
   additional data block by reference within a 'Provided-By' element of
   a PIDF-LO.  The 'emergencyCallDataReference' element has two
   attributes: 'ref' to specify the URL, and 'purpose' to indicate the
   type of data block referenced.  The value of 'ref' is an HTTPS URL
   that resolves to a data structure with information about the call.

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   The value of 'purpose' is the same as used in a 'Call-Info' header
   field (as specified in Section 4.1).

   For example, to reference a block with MIME type 'application/
   emergencyCall.ProviderInfo+xml', the 'purpose' parameter is set to
   'emergencyCallData.ProviderInfo'.  An example
   'emergencyCallDataReference' element for this would be:

      <emergencyCallDataReference ref="https://www.example.com/23sedde3"
      purpose="emergencyCallData.ProviderInfo"/>

4.3.  Transmitting Blocks by Value using the Provided-By Element

   It is RECOMMENDED that access networks supply the data specified in
   this document by reference, but they MAY provide the data by value.

   The 'emergencyCallDataValue' element is used to transmit an
   additional data block by value within a 'Provided-By' element of a
   PIDF-LO.  The 'emergencyCallDataValue' element has one attribute:
   'purpose' to indicate the type of data block contained.  The value of
   'purpose' is the same as used in a 'Call-Info' header field (as
   specified in Section 4.1, and in Section 4.1).  The same XML
   structure as would be contained in the corresponding MIME type body
   part is placed inside the 'emergencyCallDataValue' element.

   For example:

         <provided-by
           xmlns="urn:ietf:params:xml:ns:emergencyCallAddlData">
           <emergencyCallData>
             <byRef purpose="emergencyCallData.ServiceInfo"
                    ref="https://example.com/ref2"/>
             <sub:emergencyCall.Comment
               xmlns:sub="urn:ietf:params:xml:ns:emergencyCall.Comment">
               <sub:Comment xml:lang="en">This is an example text.
             </sub:Comment>
             </sub:emergencyCall.Comment>
           </emergencyCallData>
           <emergencyCallDataValue
             purpose="emergencyCallData.ProviderInfo">
             <ProviderID>Test</ProviderID>
             <ProviderIDSeries>NENA</ProviderIDSeries>
             <TypeOfProviderID>Access Infrastructure Provider
           </TypeOfProviderID>
             <ContactURI>sip:15555550987@burf.example.com;user=phone
             </ContactURI>
           </emergencyCallDataValue>

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         </provided-by>

                       Example Provided-By by Value.

4.4.  The Content-Disposition Parameter

   RFC 5621 [RFC5621] discusses the handling of message bodies in SIP.
   It updates and clarifies handling originally defined in RFC 3261
   [RFC3261] based on implementation experience.  While RFC 3261 did not
   mandate support for 'multipart' message bodies, 'multipart/mixed'
   MIME bodies are used by many extensions (including this document)
   today.  For example, adding a PIDF-LO, SDP, and additional data in
   body of a SIP message requires a 'multipart' message body.

   RFC 3204 [RFC3204] and RFC 3459 [RFC3459] define the 'handling'
   parameter for the Content-Disposition header field.  These RFCs
   describe how a UAS reacts if it receives a message body whose content
   type or disposition type it does not understand.  If the 'handling'
   parameter has the value "optional", the UAS ignores the message body.
   If the 'handling' parameter has the value "required", the UAS returns
   a 415 (Unsupported Media Type) response.  The 'by-reference'
   disposition type allows a SIP message to contain a reference to the
   body part, and the SIP UA processes the body part according to the
   reference.  This is the case for the Call-info header containing a
   Content Indirection (CID) URL.

   As an example, a SIP message indicates the Content-Disposition
   parameter in the body of the SIP message as shown in Figure 10.

         Content-Type: application/sdp

         ...Omit Content-Disposition here; defaults are ok
         ...SDP goes in here

         --boundary1

         Content-Type: application/pidf+xml
         Content-ID: <target123@atlanta.example.com>
         Content-Disposition: by-reference;handling=optional

         ...PIDF-LO goes in here

         --boundary1--

         Content-Type: application/emergencyCall.ProviderInfo+xml
         Content-ID: <1234567890@atlanta.example.com>

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         Content-Disposition: by-reference; handling=optional

         ...Data provider information data goes in here

         --boundary1--

    Figure 10: Example for use of the Content-Disposition Parameter in
                                   SIP.

5.  Examples

   This section illustrates a longer and more complex example, as shown
   in Figure 11.  In this example additional data is added by the end
   device, included by the VoIP provider (via the PIDF-LO), and provided
   by the access network provider.

   [================]   (1)                  [================]
   [   O   +----+   ]   Emergency Call       [                ]
   [  /|\  | UA |------------------------------->             ]
   [   |   +----+   ]   +Device Info         [                ]
   [  / \           ]   +Data Provider Info  [                ]
   [                ]   +Location URI        [                ]
   [ Access Network ]                        [                ]
   [   Provider     ]                        [  VoIP Provider ]
   [                ]                        [   example.org  ]
   [       ^        ]                        [                ]
   [=======.========]                        [============|===]
           .                                              |
           .                                              |
           .                 [================]           |
           .                 [                ]   (2)     |
           .    (3)          [             <--------------+
           ....................>     PSAP     ]  Emergency Call
     Location                [                ]  +Device Info
     +Owner/Subscriber Info  [                ]  +Data Provider Info #2
     +Device Info            [                ]  +Location URI
     +Data Provider Info #3  [================]

     Legend:

         --- Emergency Call Setup Procedure
         ... Location Retrieval/Response

                  Figure 11: Additional Data Example Flow

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   The example scenario starts with the end device itself adding device
   information, owner/subscriber information, a location URI, and data
   provider information to the outgoing emergency call setup message
   (see step #1 in Figure 11).  The SIP INVITE example is shown in
   Figure 12.

      INVITE urn:service:sos SIP/2.0
      Via: SIPS/2.0/TLS server.example.com;branch=z9hG4bK74bf9
      Max-Forwards: 70
      To: <urn:service:sos>
      From: Hannes Tschofenig <sips:hannes@example.com>;tag=9fxced76sl
      Call-ID: 3848276298220188511@example.com
      Call-Info: <http://wwww.example.com/hannes/photo.jpg> ;purpose=icon,
        <http://www.example.com/hannes/> ;purpose=info,
        <cid:1234567890@atlanta.example.com>
            ;purpose=emergencyCallData.ProviderInfo,
        <cide:0123456789@atlanta.example.com>
            ;purpose=emergencyCallData.DeviceInfo
      Geolocation: <https://ls.example.net:9768/357yc6s64ceyoiuy5ax3o>
      Geolocation-Routing: yes
      Accept: application/sdp, application/pidf+xml,
         application/emergencyCallProviderinfo+xml
      CSeq: 31862 INVITE
      Contact: <sips:hannes@example.com>
      Content-Type: multipart/mixed; boundary=boundary1

      Content-Length: ...

      --boundary1

      Content-Type: application/sdp

      ...SDP goes here

      --boundary1--

      Content-Type: application/emergencyCallData.DeviceInfo+xml
      Content-ID: <0123456789@atlanta.example.com>
      Content-Disposition: by-reference;handling=optional
   <?xml version="1.0" encoding="UTF-8"?>

   <dev:emergencyCallData.DeviceInfo
        xmlns:dev="urn:ietf:params:xml:ns:emergencycalldata:DeviceInfo"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
           <dev:id>12345</svc:id>
       <dev:DeviceClassification>SoftPhn</dev:DeviceClassification>
       <dev:UniqueDeviceID>00-0d-4b-30-72-df</dev:UniqueDeviceID>

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       <dev:TypeOfDeviceID>MAC</dev:TypeOfDeviceID>
   </dev:emergencyCallData.DeviceInfo>

      --boundary1--

      Content-Type: application/emergencyCallData.ProviderInfo+xml
      Content-ID: <1234567890@atlanta.example.com>
      Content-Disposition: by-reference;handling=optional
   <?xml version="1.0" encoding="UTF-8"?>
   <pi:emergencyCallData.ProviderInfo
       xmlns:pi="urn:ietf:params:xml:ns:emergencycalldata:providerinfo"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
           <pi:id>12345</pi:id>
         <pi:DataProviderString>Hannes Tschofenig
         </pi:DataProviderString>
       <pi:TypeOfProvider>Other</pi:TypeOfProvider>
       <pi:ContactURI>sip:hannes@example.com</pi:ContactURI>
       <pi:Language>EN</pi:Language>
       <xc:DataProviderContact
           xmlns:xc="urn:ietf:params:xml:ns:vcard-4.0">
                   <vcard>
                       <fn><text>Hannes Tschofenig</text></fn>
                       <n>
                           <surname>Hannes</surname>
                           <given>Tschofenig</given>
                           <additional/>
                           <prefix/>
                           <suffix>Dipl. Ing.</suffix>
                       </n>
                       <bday><date>--0203</date></bday>
                       <anniversary>
                           <date-time>20090808T1430-0500</date-time>
                       </anniversary>
                       <gender><sex>M</sex></gender>
                       <lang>
                           <parameters><pref><integer>1</integer></pref>
                           </parameters>
                           <language-tag>de</language-tag>
                       </lang>
                       <lang>
                           <parameters><pref><integer>2</integer></pref>
                           </parameters>
                           <language-tag>en</language-tag>
                       </lang>
                       <adr>
                           <parameters>
                               <type><text>work</text></type>

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                               <label><text>Hannes Tschofenig
                                   Linnoitustie 6
                                   Espoo, Finland
                                   02600</text></label>
                           </parameters>
                           <pobox/>
                           <ext/>
                           <street>Linnoitustie 6</street>
                           <locality>Espoo</locality>
                           <region>Uusimaa</region>
                           <code>02600</code>
                           <country>Finland</country>
                       </adr>
                       <tel>
                           <parameters>
                               <type>
                                   <text>work</text>
                                   <text>voice</text>
                               </type>
                           </parameters>
                           <uri>tel:+358 50 4871445</uri>
                       </tel>
                       <email>
                           <parameters><type><text>work</text></type>
                           </parameters>
                           <text>hannes.tschofenig@nsn.com</text>
                       </email>
                       <geo>
                           <parameters><type><text>work</text></type>
                           </parameters>
                           <uri>geo:60.210796,24.812924</uri>
                       </geo>
                       <key>
                           <parameters>
                                      <type><text>home</text></type>
                           </parameters>
                           <uri>https://www.example.com/key.asc
                                       </uri>
                       </key>
                       <tz><text>Finland/Helsinki</text></tz>
                       <url>
                           <parameters><type><text>home</text></type>
                           </parameters>
                           <uri>http://example.com/hannes.tschofenig</uri>
                       </url>
                   </vcard>
       </xc:DataProviderContact>
   </pi:emergencyCallData.ProviderInfo>

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      --boundary1--

      Figure 12: End Device sending SIP INVITE with Additional Data.

   In this example, information available to the access network operator
   is included in the call setup message only indirectly via the use of
   the location reference.  The PSAP has to retrieve it via a separate
   look-up step.  Since the access network provider and the VoIP service
   provider are two independent entities in this scenario the access
   network operator is not involved in the processing of application
   layer exchanges and forwards the SIP INVITE transparently, as
   illustrated in step #1.  No change to the SIP INVITE is applied.

   When the VoIP service provider receives the message and determines
   based on the Service URN that the incoming request is an emergency
   call.  It performs the typical emergency services related tasks,
   including location-based routing, and adds additional data, namely
   service and subscriber information, to the outgoing message.  For the
   example we assume a VoIP service provider that deploys a back-to-back
   user agent allowing additional data to be included in the body of the
   SIP message (rather than per reference in the header), which allows
   us to illustrate the use of multiple data provider info blocks.  The
   resulting message is shown in Figure 13.

      INVITE sips:psap@example.org SIP/2.0
      Via: SIPS/2.0/TLS server.example.com;branch=z9hG4bK74bf9
      Max-Forwards: 70
      To: <urn:service:sos>
      From: Hannes Tschofenig <sips:hannes@example.com>;tag=9fxced76sl
      Call-ID: 3848276298220188511@example.com
      Call-Info: <http://wwww.example.com/hannes/photo.jpg> ;purpose=icon,
        <http://www.example.com/hannes/> ;purpose=info,
        <cid:1234567890@atlanta.example.com>
            ;purpose=emergencyCallData.ProviderInfo
        <cid:0123456789@atlanta.example.com>
            ;purpose=emergencyCallData.DeviceInfo
      Call-Info: <cid:bloorpyhex@atlanta.example.com>
            ;purpose=emergencyCallData.ServiceInfo
      Call-Info: <cid:aaabbb@atlanta.example.com>
            ;purpose=emergencyCallData.ProviderInfo
      Geolocation: <https://ls.example.net:9768/357yc6s64ceyoiuy5ax3o>
      Geolocation-Routing: yes
      Accept: application/sdp, application/pidf+xml,
         application/emergencyCallData.ProviderInfo+xml
      CSeq: 31862 INVITE
      Contact: <sips:hannes@example.com>
      Content-Type: multipart/mixed; boundary=boundary1

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      Content-Length: ...

      --boundary1

      Content-Type: application/sdp

      ...SDP goes here

      --boundary1--

      Content-Type: application/emergencyCallData.DeviceInfo+xml
      Content-ID: <0123456789@atlanta.example.com>
      Content-Disposition: by-reference;handling=optional
   <?xml version="1.0" encoding="UTF-8"?>

   <dev:emergencyCallData.DeviceInfo
        xmlns:dev="urn:ietf:params:xml:ns:emergencycalldata:DeviceInfo"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
           <dev:id>12345</svc:id>
       <dev:DeviceClassification>SoftPhn</dev:DeviceClassification>
       <dev:UniqueDeviceID>00-0d-4b-30-72-df</dev:UniqueDeviceID>
       <dev:TypeOfDeviceID>MAC</dev:TypeOfDeviceID>
   </dev:emergencyCallData.DeviceInfo>

      --boundary1--

      Content-Type: application/emergencyCallData.ProviderInfo+xml
      Content-ID: <1234567890@atlanta.example.com>
      Content-Disposition: by-reference;handling=optional
   <?xml version="1.0" encoding="UTF-8"?>
   <pi:emergencyCallData.ProviderInfo
       xmlns:pi="urn:ietf:params:xml:ns:emergencycalldata:providerinfo"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
           <pi:id>12345</pi:id>
         <pi:DataProviderString>Hannes Tschofenig
         </pi:DataProviderString>
       <pi:TypeOfProvider>Other</pi:TypeOfProvider>
       <pi:ContactURI>sip:hannes@example.com</pi:ContactURI>
       <pi:Language>EN</pi:Language>
       <xc:DataProviderContact
           xmlns:xc="urn:ietf:params:xml:ns:vcard-4.0">
                   <vcard>
                       <fn><text>Hannes Tschofenig</text></fn>
                       <n>
                           <surname>Hannes</surname>
                           <given>Tschofenig</given>
                           <additional/>
                           <prefix/>

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                           <suffix>Dipl. Ing.</suffix>
                       </n>
                       <bday><date>--0203</date></bday>
                       <anniversary>
                           <date-time>20090808T1430-0500</date-time>
                       </anniversary>
                       <gender><sex>M</sex></gender>
                       <lang>
                           <parameters><pref><integer>1</integer></pref>
                           </parameters>
                           <language-tag>de</language-tag>
                       </lang>
                       <lang>
                           <parameters><pref><integer>2</integer></pref>
                           </parameters>
                           <language-tag>en</language-tag>
                       </lang>
                       <adr>
                           <parameters>
                               <type><text>work</text></type>
                               <label><text>Hannes Tschofenig
                                   Linnoitustie 6
                                   Espoo, Finland
                                   02600</text></label>
                           </parameters>
                           <pobox/>
                           <ext/>
                           <street>Linnoitustie 6</street>
                           <locality>Espoo</locality>
                           <region>Uusimaa</region>
                           <code>02600</code>
                           <country>Finland</country>
                       </adr>
                       <tel>
                           <parameters>
                               <type>
                                   <text>work</text>
                                   <text>voice</text>
                               </type>
                           </parameters>
                           <uri>tel:+358 50 4871445</uri>
                       </tel>
                       <email>
                           <parameters><type><text>work</text></type>
                           </parameters>
                           <text>hannes.tschofenig@nsn.com</text>
                       </email>
                       <geo>

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                           <parameters><type><text>work</text></type>
                           </parameters>
                           <uri>geo:60.210796,24.812924</uri>
                       </geo>
                       <key>
                           <parameters>
                                      <type><text>home</text></type>
                           </parameters>
                           <uri>https://www.example.com/key.asc
                                       </uri>
                       </key>
                       <tz><text>Finland/Helsinki</text></tz>
                       <url>
                           <parameters><type><text>home</text></type>
                           </parameters>
                           <uri>http://example.com/hannes.tschofenig</uri>
                       </url>
                   </vcard>
       </xc:DataProviderContact>
   </pi:emergencyCallData.ProviderInfo>

      --boundary1--

      Content-Type: application/emergencyCall.ServiceInfo+xml
      Content-ID: <bloorpyhex@atlanta.example.com>
      Content-Disposition: by-reference;handling=optional
   <?xml version="1.0" encoding="UTF-8"?>
   <svc:emergencyCall.ServiceInfo
        xmlns:svc="urn:ietf:params:xml:ns:emergencyCall.ServiceInfo"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
           <svc:id>abc123</svc:id>
       <svc:SvcEnvironment>Residence</svc:SvcEnvironment>
       <svc:SvcDelByProvider>VOIP</svc:SvcDelByProvider>
       <svc:SvcMobility>Unknown</svc:SvcMobility>
   </svc:emergencyCall.ServiceInfo>

      --boundary1--

      Content-Type: application/emergencyCallData.ProviderInfo+xml
      Content-ID: <aaabbb@atlanta.example.com>
      Content-Disposition: by-reference;handling=optional
   <?xml version="1.0" encoding="UTF-8"?>
   <pi:emergencyCallData.ProviderInfo
       xmlns:pi="urn:ietf:params:xml:ns:emergencycalldata:providerinfo"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
           <pi:id>abc123</pi:id>
       <pi:DataProviderString>Example VoIP Provider
         </pi:DataProviderString>

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       <pi:ProviderID>urn:nena:companyid:ID123</pi:ProviderID>
       <pi:ProviderIDSeries>NENA</pi:ProviderIDSeries>
       <pi:TypeOfProvider>Service Provider</pi:TypeOfProvider>
       <pi:ContactURI>sip:voip-provider@example.com</pi:ContactURI>
       <pi:Language>EN</pi:Language>
       <xc:DataProviderContact
           xmlns:xc="urn:ietf:params:xml:ns:vcard-4.0">
                   <vcard>
                       <fn><text>John Doe</text></fn>
                       <n>
                           <surname>John</surname>
                           <given>Doe</given>
                           <additional/>
                           <prefix/>
                           <suffix/>
                       </n>
                       <bday><date>--0203</date></bday>
                       <anniversary>
                           <date-time>20090808T1430-0500</date-time>
                       </anniversary>
                       <gender><sex>M</sex></gender>
                       <lang>
                           <parameters><pref><integer>1</integer></pref>
                           </parameters>
                           <language-tag>en</language-tag>
                       </lang>
                       <org>
                           <parameters><type><text>work</text></type>
                           </parameters>
                           <text>Example VoIP Provider</text>
                       </org>
                       <adr>
                           <parameters>
                               <type><text>work</text></type>
                               <label><text>John Doe
                                   Downing Street 10
                                   London, UK</text></label>
                           </parameters>
                           <pobox/>
                           <ext/>
                           <street>Downing Street 10</street>
                           <locality>London</locality>
                           <region/>
                           <code>SW1A 2AA</code>
                           <country>UK</country>
                       </adr>
                       <tel>
                           <parameters>

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                               <type>
                                   <text>work</text>
                                   <text>voice</text>
                               </type>
                           </parameters>
                           <uri>sips:john.doe@example.com</uri>
                       </tel>
                       <email>
                           <parameters><type><text>work</text></type>
                           </parameters>
                           <text>john.doe@example.com</text>
                       </email>
                       <geo>
                           <parameters><type><text>work</text></type>
                           </parameters>
                           <uri>geo:51.503396, 0.127640</uri>
                       </geo>
                       <tz><text>Europe/London</text></tz>
                       <url>
                           <parameters><type><text>home</text></type>
                           </parameters>
                           <uri>http://www.example.com/john.doe</uri>
                       </url>
                   </vcard>
       </xc:DataProviderContact>
   </pi:emergencyCallData.ProviderInfo>

     Figure 13: VoIP Provider sending SIP INVITE with Additional Data.

   Finally, the PSAP requests location information from the access
   network operator.  The response is shown in Figure 14.  Along with
   the location information additional data is provided in the
   <Provided-By> element of the PIDF-LO.

   <?xml version="1.0" encoding="UTF-8"?>
   <presence xmlns="urn:ietf:params:xml:ns:pidf"
   xmlns:gp="urn:ietf:params:xml:ns:pidf:geopriv10"
   xmlns:gbp="urn:ietf:params:xml:ns:pidf:geopriv10:basicPolicy"
   xmlns:dm="urn:ietf:params:xml:ns:pidf:data-model"
   entity="pres:alice@atlanta.example.com">
     <dm:device id="target123-1">
       <gp:geopriv>
         <gp:location-info>
           <civicAddress
           xmlns="urn:ietf:params:xml:ns:pidf:geopriv10:civicAddr">
             <country>AU</country>
             <A1>NSW</A1>

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             <A3>Wollongong</A3>
             <A4>North Wollongong</A4>
             <RD>Flinders</RD>
             <STS>Street</STS>
             <RDBR>Campbell Street</RDBR>
             <LMK>Gilligan's Island</LMK>
             <LOC>Corner</LOC>
             <NAM>Video Rental Store</NAM>
             <PC>2500</PC>
             <ROOM>Westerns and Classics</ROOM>
             <PLC>store</PLC>
             <POBOX>Private Box 15</POBOX>
           </civicAddress>
         </gp:location-info>
         <gp:usage-rules>
           <gbp:retransmission-allowed>true
           </gbp:retransmission-allowed>
           <gbp:retention-expiry>2013-12-10T20:00:00Z
           </gbp:retention-expiry>
         </gp:usage-rules>
         <gp:method>802.11</gp:method>

             <provided-by
         xmlns="urn:ietf:params:xml:ns:emergencycalldata">

          <emergencyCallDataReference purpose="emergencyCallData.ServiceInfo"
           ref="https://example.com/ref2"/>

          <emergencyCallDataValue>
           <emergencyCallData.ProviderInfo
               xmlns="urn:ietf:params:xml:ns:emergencycalldata:providerinfo">
               <DataProviderString>University of California, Irvine
               </DataProviderString>
               <ProviderID>urn:nena:companyid:uci</ProviderID>
               <ProviderIDSeries>NENA</ProviderIDSeries>
               <TypeOfProvider>Other</TypeOfProvider>
               <ContactURI>tel:+1 9498245222</ContactURI>
               <Language>EN</Language>
           </emergencyCallData.ProviderInfo>

           <emergencyCallData.Comment
               xmlns="urn:ietf:params:xml:ns:emergencycalldata:comment">
               <Comment xml:lang="en">This is an example text.</Comment>
           </emergencyCallData.Comment>

          </emergencyCallDataValue>
         </provided-by>
       </gp:geopriv>

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       <dm:deviceID>mac:00-0d-4b-30-72-df</dm:deviceID>
       <dm:timestamp>2013-07-09T20:57:29Z</dm:timestamp>
     </dm:device>
   </presence>

   Figure 14: Access Network Provider returning PIDF-LO with Additional
                                   Data.

6.  XML Schemas

   This section defines the XML schemas of the five data blocks.
   Additionally, the Provided-By schema is specified.

6.1.  emergencyCallData.ProviderInfo XML Schema

   <?xml version="1.0"?>
   <xs:schema
      targetNamespace=
                         "urn:ietf:params:xml:ns:emergencycalldata:providerinfo"
      xmlns:xs="http://www.w3.org/2001/XMLSchema"
      xmlns:pi="urn:ietf:params:xml:ns:emergencycalldata:providerinfo"
      xmlns:xml="http://www.w3.org/XML/1998/namespace"
      xmlns:xc="urn:ietf:params:xml:ns:vcard-4.0"
      elementFormDefault="qualified"
      attributeFormDefault="unqualified">

        <xs:import namespace="http://www.w3.org/XML/1998/namespace"
                   schemaLocation="http://www.w3.org/2001/xml.xsd"/>

       <xs:import namespace="urn:ietf:params:xml:ns:vcard-4.0">

        <xs:simpleType name="iso3166a2">
          <xs:restriction base="xs:token">
            <xs:pattern value="[A-Z]{2}"/>
          </xs:restriction>
        </xs:simpleType>

       <xs:element
           name="emergencyCallData.ProviderInfo"
           type="pi:ProviderInfoType"/>

       <xs:simpleType name="SubcontractorPriorityType">
          <xs:restriction base="xs:string">
               <xs:enumeration value="sub"/>
               <xs:enumeration value="main"/>
          </xs:restriction>

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       </xs:simpleType>

           <xs:complexType name="ProviderInfoType">
               <xs:sequence>
                   <xs:element name="id"
                       type="xs:string" minOccurs="1" maxOccurs="1"/>

                   <xs:element name="DataProviderString"
                       type="xs:string" minOccurs="1" maxOccurs="1"/>

                   <xs:element name="ProviderID"
                       type="xs:string" minOccurs="0" maxOccurs="1"/>

                   <xs:element name="ProviderIDSeries"
                       type="xs:string" minOccurs="0" maxOccurs="1"/>

                   <xs:element name="TypeOfProvider"
                       type="xs:string" minOccurs="0" maxOccurs="1"/>

                   <xs:element name="ContactURI" type="xs:anyURI"
                       minOccurs="1" maxOccurs="1"/>

                   <xs:element name="Language" type="pi:iso3166a2"
                       minOccurs="0" maxOccurs="unbounded" />

                   <xs:element name="DataProviderContact"
                         type="xc:vcardType" minOccurs="0"
                         maxOccurs="1"/>

                   <xs:element name="SubcontratorPrincipal"
                       type="xs:string" minOccurs="0" maxOccurs="1"/>

                   <xs:element name="SubcontractorPriority"
                       type="pi:SubcontractorPriorityType" minOccurs="0" maxOccurs="1"/>

                   <xs:any namespace="##other" processContents="lax"
                       minOccurs="0" maxOccurs="unbounded"/>
               </xs:sequence>
           </xs:complexType>

   </xs:schema>

           Figure 15: emergencyCallData.ProviderInfo XML Schema.

6.2.  emergencyCallData.ServiceInfo XML Schema

   <?xml version="1.0"?>

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   <xs:schema
        targetNamespace=
                         "urn:ietf:params:xml:ns:emergencycalldata:ServiceInfo"
        xmlns:xs="http://www.w3.org/2001/XMLSchema"
        xmlns:svc="urn:ietf:params:xml:ns:emergencycalldata:ServiceInfo"
        xmlns:xml="http://www.w3.org/XML/1998/namespace"
        elementFormDefault="qualified" attributeFormDefault="unqualified">

        <xs:import namespace="http://www.w3.org/XML/1998/namespace"
                   schemaLocation="http://www.w3.org/2001/xml.xsd"/>

       <xs:element name="emergencyCallData.ServiceInfo" type="svc:ServiceInfoType"/>

       <xs:complexType name="ServiceInfoType">
               <xs:sequence>
                  <xs:element name="id"
                     type="xs:string" minOccurs="1" maxOccurs="1"/>

                   <xs:element name="SvcEnvironment"
                     type="xs:string" minOccurs="1" maxOccurs="1"/>

                   <xs:element name="SvcDelByProvider"
                     type="xs:string" minOccurs="1" maxOccurs="1"/>

                   <xs:element name="SvcMobility"
                     type="xs:string" minOccurs="1" maxOccurs="1"/>

                   <xs:element name="Link"
                       type="xs:string" minOccurs="0" maxOccurs="1"/>

                   <xs:any namespace="##other" processContents="lax"
                      minOccurs="0" maxOccurs="unbounded"/>
               </xs:sequence>
       </xs:complexType>

   </xs:schema>

           Figure 16: emergencyCallData.ServiceInfo XML Schema.

6.3.  emergencyCallData.DeviceInfo XML Schema

   <?xml version="1.0"?>
   <xs:schema
        targetNamespace="urn:ietf:params:xml:ns:emergencycalldata:DeviceInfo"
        xmlns:xs="http://www.w3.org/2001/XMLSchema"
        xmlns:dev="urn:ietf:params:xml:ns:emergencycalldata:DeviceInfo"
        xmlns:xml="http://www.w3.org/XML/1998/namespace"

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        elementFormDefault="qualified" attributeFormDefault="unqualified">

        <xs:import namespace="http://www.w3.org/XML/1998/namespace"
                   schemaLocation="http://www.w3.org/2001/xml.xsd"/>

       <xs:element name="emergencyCallData.DeviceInfo" type="dev:DeviceInfoType"/>

       <xs:complexType name="DeviceInfoType">
               <xs:sequence>
                  <xs:element name="id"
                       type="xs:string" minOccurs="1" maxOccurs="1"/>

                   <xs:element name="DeviceClassification"
                       type="xs:string" minOccurs="0" maxOccurs="1"/>

                   <xs:element name="DeviceMfgr"
                       type="xs:string" minOccurs="0" maxOccurs="1"/>

                   <xs:element name="DeviceModelNr"
                       type="xs:string" minOccurs="0" maxOccurs="1"/>

                   <xs:element name="UniqueDeviceID"
                       type="xs:string" minOccurs="0" maxOccurs="1"/>

                   <xs:element name="TypeOfDeviceID"
                       type="xs:string" minOccurs="0" maxOccurs="1"/>

                   <xs:element name="DeviceSpecificData"
                       type="xs:anyURI" minOccurs="0" maxOccurs="1"/>

                   <xs:element name="DeviceSpecificType"
                       type="xs:string" minOccurs="0" maxOccurs="1"/>

                   <xs:any namespace="##other" processContents="lax"
                       minOccurs="0" maxOccurs="unbounded"/>
               </xs:sequence>
           </xs:complexType>

   </xs:schema>

            Figure 17: emergencyCallData.DeviceInfo XML Schema.

6.4.  emergencyCallData.SubscriberInfo XML Schema

   <?xml version="1.0"?>
   <xs:schema
       targetNamespace=

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                         "urn:ietf:params:xml:ns:emergencycalldata:SubscriberInfo"
       xmlns:xs="http://www.w3.org/2001/XMLSchema"
       xmlns:sub="urn:ietf:params:xml:ns:emergencycalldata:SubscriberInfo"
       xmlns:xc="urn:ietf:params:xml:ns:vcard-4.0"
       xmlns:xml="http://www.w3.org/XML/1998/namespace"
       elementFormDefault="qualified" attributeFormDefault="unqualified">

       <xs:import namespace="http://www.w3.org/XML/1998/namespace"
           schemaLocation="http://www.w3.org/2001/xml.xsd"/>

         <xs:import namespace="urn:ietf:params:xml:ns:vcard-4.0"/>

       <xs:element name="emergencyCallData.SubscriberInfo" type="sub:SubscriberInfoType"/>

           <xs:complexType name="SubscriberInfoType">
             <xs:complexContent>
               <xs:sequence>
                   <xs:element name="id"
                     type="xs:string" minOccurs="1" maxOccurs="1"/>

                   <xs:element  name="SubscriberData"  type="xc:vcardType"
                       minOccurs="0" maxOccurs="1" />

                <xs:any namespace="##other" processContents="lax"
                      minOccurs="0" maxOccurs="unbounded"/>
               </xs:sequence>
               <xs:attribute name="privacyRequested" type="xs:boolean" use="required"/>
             </xs:complexContent>
           </xs:complexType>

   </xs:schema>

          Figure 18: emergencyCallData.SubscriberInfo XML Schema.

6.5.  emergencyCallData.Comment XML Schema

   <?xml version="1.0"?>
   <xs:schema
        targetNamespace=
                         "urn:ietf:params:xml:ns:emergencycalldata:comment"
        xmlns:xs="http://www.w3.org/2001/XMLSchema"
        xmlns:com="urn:ietf:params:xml:ns:emergencycalldata:comment"
        xmlns:xml="http://www.w3.org/XML/1998/namespace"
        elementFormDefault="qualified" attributeFormDefault="unqualified">

        <xs:import namespace="http://www.w3.org/XML/1998/namespace"
                   schemaLocation="http://www.w3.org/2001/xml.xsd"/>

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       <xs:element name="emergencyCallData.Comment" type="com:CommentType"/>

       <xs:complexType name="CommentType">
               <xs:sequence>
                   <xs:element name="id"
                     type="xs:string" minOccurs="1" maxOccurs="1"/>

                   <xs:element name="Comment"
                       type="com:CommentSubType" minOccurs="0"
                       maxOccurs="unbounded"/>

                   <xs:any namespace="##other" processContents="lax"
                       minOccurs="0" maxOccurs="unbounded"/>
              </xs:sequence>
           </xs:complexType>

       <xs:complexType name="CommentSubType">
        <xs:simpleContent>
         <xs:extension base="xs:string">
          <xs:attribute ref="xml:lang"/>
         </xs:extension>
        </xs:simpleContent>
       </xs:complexType>

   </xs:schema>

             Figure 19: EmergencyCallData.Comment XML Schema.

6.6.  Provided-By XML Schema

   This section defines the Provided-By schema.

   <?xml version="1.0"?>
   <xs:schema
       targetNamespace=
       "urn:ietf:params:xml:ns:pidf:geopriv10:emergencyCallData"
       xmlns:xs="http://www.w3.org/2001/XMLSchema"
       xmlns:ad="urn:ietf:params:xml:ns:pidf:geopriv10:emergencyCallData"
       xmlns:xml="http://www.w3.org/XML/1998/namespace"
       xmlns:pi="urn:ietf:params:xml:ns:emergencycalldata:providerinfo"
       xmlns:svc="urn:ietf:params:xml:ns:emergencycalldata:ServiceInfo"
       xmlns:dev="urn:ietf:params:xml:ns:emergencycalldata:DeviceInfo"
       xmlns:sub="urn:ietf:params:xml:ns:emergencycalldata:SubscriberInfo"
       xmlns:com="urn:ietf:params:xml:ns:emergencycalldata:comment"
       elementFormDefault="qualified" attributeFormDefault="unqualified">

       <xs:import namespace="urn:ietf:params:xml:ns:emergencycalldata:providerinfo"/>

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       <xs:import namespace="urn:ietf:params:xml:ns:emergencycalldata:ServiceInfo"/>
       <xs:import namespace="urn:ietf:params:xml:ns:emergencycalldata:DeviceInfo"/>
       <xs:import namespace="urn:ietf:params:xml:ns:emergencycalldata:SubscriberInfo"/>
       <xs:import namespace="urn:ietf:params:xml:ns:emergencycalldata:comment"/>

       <xs:element name="provided-by" type="ad:provided-by-Type"/>

       <xs:complexType name="provided-by-Type">
           <xs:sequence>
               <xs:element name="id"
                   type="xs:string" minOccurs="1" maxOccurs="1"/>

               <xs:element name="emergencyCallDataReference"
                   type="ad:ByRefType"
                   minOccurs="0" maxOccurs="unbounded"/>

               <xs:element name="emergencyCallDataValue"
                   type="ad:emergencyCallDataValueType"
                   minOccurs="0" maxOccurs="unbounded"/>

               <xs:any namespace="##other" processContents="lax"
                   minOccurs="0" maxOccurs="unbounded"/>

           </xs:sequence>

       </xs:complexType>

       <!-- Additional Data By Reference -->

       <xs:complexType name="ByRefType">
           <xs:complexContent>
               <xs:restriction base="xs:anyType">
                   <xs:sequence>
                       <xs:any namespace="##other" minOccurs="0"
                           maxOccurs="unbounded" processContents="lax"/>
                   </xs:sequence>
                   <xs:attribute name="purpose" type="xs:anyURI"
                       use="required"/>
                   <xs:attribute name="ref" type="xs:anyURI"
                       use="required"/>
               </xs:restriction>
           </xs:complexContent>
       </xs:complexType>

       <!-- Additional Data By Value -->

       <xs:complexType name="emergencyCallDataValueType">
               <xs:sequence>

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                   <xs:element name="emergencyCallData.ProviderInfo"
                       type="pi:ProviderInfoType"
                       minOccurs="0" maxOccurs="unbounded"/>
                   <xs:element name="emergencyCallData.ServiceInfo"
                       type="svc:ServiceInfoType"
                       minOccurs="0" maxOccurs="unbounded"/>
                   <xs:element name="emergencyCallData.DeviceInfo"
                       type="dev:DeviceInfoType"
                       minOccurs="0" maxOccurs="unbounded"/>
                   <xs:element name="emergencyCallData.SubscriberInfo"
                       type="sub:SubscriberInfoType"
                       minOccurs="0" maxOccurs="unbounded"/>
                   <xs:element name="emergencyCallData.Comment"
                       type="com:CommentType"
                       minOccurs="0" maxOccurs="unbounded"/>

                   <xs:any namespace="##other" processContents="lax"
                       minOccurs="0" maxOccurs="unbounded"/>

               </xs:sequence>
           </xs:complexType>

   </xs:schema>

                    Figure 20: Provided-By XML Schema.

7.  Security Considerations

   The information in this data structure will usually be considered
   private.  HTTPS is specified to require the provider of the
   information to validate the credentials of the requester.  While the
   creation of a public key infrastructure (PKI) that has global scope
   may be difficult, the alternatives to creating devices and services
   that can provide critical information securely are more daunting.
   The provider may enforce any policy it wishes to use, but PSAPs and
   responder agencies should deploy a PKI so that providers of
   additional data can check the certificate of the client and decide
   the appropriate policy to enforce based on that certificate.

   Ideally, the PSAP and emergency responders will be given credentials
   signed by an authority trusted by the data provider.  In most
   circumstances, nationally recognized credentials would be sufficient,
   and if the emergency services arranges a PKI, data providers could be
   provisioned with the root CA public key for a given nation.  Some
   nations are developing a PKI for this, and related, purposes.  Since
   calls could be made from devices where the device and/or the service
   provider(s) are not local to the emergency authorities, globally
   recognized credentials are useful.  This might be accomplished by

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   extending the notion of the "forest guide" described in [RFC5222] to
   allow the forest guide to provide the credential of the PKI root for
   areas that it has coverage information for, but standards for such a
   mechanism are not yet available.  In its absence, the data provider
   will need to obtain the root CA credentials for any areas it is
   willing to provide additional data by out of band means.  With the
   credential of the root CA for a national emergency services PKI, the
   data provider server can validate the credentials of an entity
   requesting additional data by reference.

   The data provider also needs a credential that can be verified by the
   emergency services to know that it is receiving data from the right
   server.  The emergency authorities could provide credentials,
   distinguishable from credentials it provides to emergency responders
   and PSAPs, which could be used to validate data providers.  Such
   credentials would have to be acceptable to any PSAP or responder that
   could receive a call with additional data supplied by that provider.
   This would be extensible to global credential validation using the
   forest guide as above.  In the absence of such credentials, the
   emergency authorities could maintain a list of local data providers'
   credentials provided to it out of band.  At a minimum, the emergency
   authorities could obtain a credential from the DNS entry of the
   domain in the Additional Data URI to at least validate that the
   server is known to the domain providing the URI.

   Data provided by devices by reference have similar credential
   validation issues to service providers, and the solutions are the
   same.

8.  Privacy Considerations

   This document enables functionality for conveying additional
   information about the caller to the callee.  Some of this information
   is personal data and therefore privacy concerns arise.  An explicit
   privacy indicator for information directly relating to the callers
   identity is defined and use is mandatory.  However, observance of
   this request for privacy and what information it relates to is
   controlled by the destination jurisdiction.

   There are a number of privacy concerns with regular real-time
   communication services that are also applicable to emergency calling.
   Data protection regulation world-wide has, however, decided to create
   exceptions for emergency services since the drawbacks of disclosing
   personal data in comparison to the benefit for the emergency caller
   are often towards the latter.  Hence, the data protection rights of
   individuals are often waived for emergency situations.  There are,
   however, still various countries that offer some degree of anonymity
   for the caller towards PSAP call takers.

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   The functionality defined in this document, however, far exceeds the
   amount of information sharing found in the Plain old telephone system
   (POTS).  For this reason there are additional privacy threats to
   consider, which are described in more detail in [RFC6973].

   Stored Data Compromise:  First, there is an increased risk of stored
      data compromise since additional data is collected and stored in
      databases.  Without adequate measures to secure stored data from
      unauthorized or inappropriate access at access network operators,
      service providers, end devices, as well as PSAPs individuals are
      exposed to potential financial, reputational, or physical harm.

   Misattribution:  If the personal data collected and conveyed is
      incorrect or inaccurate then this may lead to misattribution.
      Misattribution occurs when data or communications related to one
      individual are attributed to another.

   Identification:  By the nature of the additional data and its
      capability to provide much richer information about the caller,
      the call, and the location the calling party is identified in a
      much better way.  Some users may feel uncomfortable with this
      degree of information sharing even in emergency services
      situations.

   Secondary Use:  Furthermore, there is the risk of secondary use.
      Secondary use is the use of collected information about an
      individual without the individual's consent for a purpose
      different from that for which the information was collected.  The
      stated purpose of the additional data is for emergency services
      purposes but theoretically the same information could be used for
      any other call as well.  Additionally, parties involved in the
      emergency call may retain the obtained information and may re-use
      it for other, non-emergency services purposes.

   Disclosure:  When the data defined in this document is not properly
      security (while in transit with traditional communication security
      techniques, and while at rest using access control mechanisms)
      there is the risk of disclosure, which is the revelation of
      information about an individual that affects the way others judge
      the individual.

   To mitigate these privacy risks the following countermeasures can be
   taken.

   In regions where callers can elect to suppress certain personally
   identifying information, the network or PSAP functionality can
   inspect privacy flags within the SIP headers to determine what
   information may be passed, stored, or displayed to comply with local

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   policy or law.  RFC 3325 [RFC3325] defines the "id" priv-value token.
   The presence of this privacy type in a Privacy header field indicates
   that the user would like the network asserted identity to be kept
   private with respect to SIP entities outside the trust domain with
   which the user authenticated, including the PSAP.

   This document defines various data structures that constitutes
   personal data.  Local regulations may govern what data must be
   provided in emergency calls, but in general, the emergency call
   system is often aided by the kinds of information described in this
   document.  There is a tradeoff between the privacy considerations and
   the utility of the data.  For adequate protection this specification
   requires all data exchanges to be secured via communication security
   techniques (namely TLS) against eavesdropping and inception.
   Furthermore, security safeguards are required to prevent unauthorized
   access to data at rest.  Various security incidents over the last 10
   years have shown data breaches are not not uncommon and are often
   caused by lack of proper access control frameworks, software bugs
   (buffer overflows), or missing input parsing (SQL injection attacks).
   The risks of data breaches is increased with the obligation for
   emergency services to retain emergency call related data for extended
   periods, e.g., several years are the norm.

   Finally, it is also worth to highlight the nature of the SIP
   communication architecture, which introduces additional complications
   for privacy.  Some forms of data can be sent by value in the SIP
   signaling or by value (URL in SIP signaling).  When data is sent by
   value, all intermediaries have access to the data.  As such, these
   intermediaries may also introduce additional privacy risk.
   Therefore, in situations where the conveyed information raises
   privacy concerns and intermediaries are involved transmitting a
   reference is more appropriate (assuming proper access control
   policies are available for distinguishing the different entities
   dereferencing the reference).  Without access control policies any
   party in possession of the reference is able to resolve the reference
   and to obtain the data, including intermediaries.

9.  IANA Considerations

9.1.  Registry creation

   This document creates a new registry called 'Emergency Call
   Additional Data'.  The following sub-registries are created for this
   registry.

9.1.1.  Provider ID Series Registry

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   This document creates a new sub-registry called 'Additional Call Data
   Provider ID Series'.  As defined in [RFC5226], this registry operates
   under "Expert Review" rules.  The expert should determine that the
   entity requesting a new value is a legitimate issuer of service
   provider IDs suitable for use in Additional Call Data.

   The content of this registry includes:

   Name:  The identifier which will be used in the ProviderIDSeries
      element

   Source:  The full name of the organization issuing the identifiers

   URL:  A URL to the organization for further information

   The initial set of values is listed in Figure 21.

   +-----------+--------------------------+----------------------+
   | Name      | Source                   | URL                  |
   +-----------+--------------------------+----------------------+
   | NENA      | National Emergency       | http://www.nena.org  |
   |           | Number Association       |                      |
   | EENA      | European Emergency       | http://www.eena.org  |
   |           | Number Association       |                      |
   +-----------+--------------------------+----------------------+

                  Figure 21: Provider ID Series Registry.

9.1.2.  Service Environment Registry

   This document creates a new sub-registry called 'Additional Call
   Service Environment'.  As defined in [RFC5226], this registry
   operates under "Expert Review" rules.  The expert should determine
   that the entity requesting a new value is relevant for this service
   element.

   The content of this registry includes:

   Token:  The value to be used in <SvcEnvironment> element.

   Description:  A short description of the token.

   The initial set of values is listed in Figure 22.

                    +-----------+--------------------------+
                    | Token     | Description              |
                    +-----------+--------------------------+
                    | Business  | [[This RFC]]             |

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                    | Residence | [[This RFC]]             |
                    +-----------+--------------------------+

                 Figure 22: Service Environment Registry.

9.1.3.  Service Provider Type Registry

   This document creates a new sub-registry called 'Service Provider
   Type'.  As defined in [RFC5226], this registry operates under "Expert
   Review".  The expert should determine that the proposed new value is
   distinct from existing values and appropriate for use in the
   TypeOfServicerProvider element

   The content of this registry includes:

   Name:  The value to be used in TypeOfServiceProvider.

   Description:  A short description of the type of service provider

   The initial set of values is defined in Figure 1.

9.1.4.  Service Delivered Registry

   This document creates a new sub-registry called 'Service Delivered'.
   As defined in [RFC5226], this registry operates under "Expert Review"
   rules.  The expert should consider whether the proposed service is
   unique from existing services and the definition of the service will
   be clear to implementors and PSAPS/responders.

   The content of this registry includes:

   Name:  Enumeration token of the service.

   Description:  Short description identifying the service.

   The initial set of values are defined in Figure 3.

9.1.5.  Device Classification Registry

   This document creates a new sub-registry called 'Device
   Classification'.  As defined in [RFC5226], this registry operates
   under "Expert Review" rules.  The expert should consider whether the
   proposed class is unique from existing classes and the definition of
   the class will be clear to implementors and PSAPS/responders.

   The content of this registry includes:

   Name:  Enumeration token of the device classification.

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   Description:  Short description identifying the device type.

   The initial set of values are defined in Figure 5.

9.1.6.  Device ID Type Type Registry

   This document creates a new sub-registry called 'Additional Call Data
   Device ID Type'.  As defined in [RFC5226], this registry operates
   under "Expert Review" rules.  The expert should ascertain that the
   proposed type is well understood, and provides the information useful
   to PSAPs and responders to uniquely identify a device.

   The content of this registry includes:

   Name:  Enumeration token of the device id type.

   Description:  Short description identifying type of device id.

   The initial set of values are defined in Figure 6.

9.1.7.  Device/Service Data Type Registry

   This document creates a new sub-registry called 'Device/Service Data
   Type Registry'.  As defined in [RFC5226], this registry operates
   under "Expert Review" and "Specification Required" rules.  The expert
   should ascertain that the proposed type is well understood, and
   provides information useful to PSAPs and responders.  The
   specification must contain a complete description of the data, and a
   precise format specification suitable to allow interoperable
   implementations.

   The content of this registry includes:

   Name:  Enumeration token of the data type.

   Description:  Short description identifying the the data.

   Specification:  Citation for the specification of the data.

   The initial set of values are listed in Figure 23.

   +---------+----------------------------------------+----------------+
   | Token   | Description                            | Specification  |
   +---------+----------------------------------------+----------------+
   | IEE1512 | Common Incident Management Message Set | IEEE 1512-2006 |
   +---------+----------------------------------------+----------------+
   | VEDS    | Vehicle Emergency Data Set             | APCO/NENA VEDS |
   +---------+----------------------------------------+----------------+

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               Figure 23: Device/Service Data Type Registry.

9.1.8.  Additional Data Blocks Registry

   This document creates a new sub-registry called 'Additional Data
   Blocks' in the purpose registry established by RFC 3261 [RFC3261].
   As defined in [RFC5226], this registry operates under "Expert Review"
   and "Specification Required" rules.  The expert is responsible for
   verifying that the document contains a complete and clear
   specification and the proposed functionality does not obviously
   duplicate existing functionality.

   The content of this registry includes:

   Name:  Element Name of enclosing block.

   Reference:  The document that describes the block

   The initial set of values are listed in Figure 24.

   +--------------+------------+
   | Token        | Reference  |
   +--------------+------------+
   | ProviderInfo | [This RFC] |
   | ServiceInfo      | [This RFC] |
   | DeviceInfo      | [This RFC] |
   | Subscriber   | [This RFC] |
   | Comment      | [This RFC] |
   +--------------+------------+

                Figure 24: Additional Data Blocks Registry.

9.2.  'emergencyCallData' Purpose Parameter Value

   This document defines the 'emergencyCallData' value for the "purpose"
   parameter of the Call-Info header field.  The Call-Info header and
   the corresponding registry for the 'purpose' parameter was
   established with RFC 3261 [RFC3261].

      Header       Parameter   New
      Field        Name        Value               Reference
      ----------   ---------   -----------------   ---------
      Call-Info    purpose     emergencyCallData   [This RFC]

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9.3.  URN Sub-Namespace Registration for provided-by Registry Entry

   This section registers the namespace specified in Section 9.5.1 in
   the provided-by registry established by RFC 4119, for usage within
   the <provided-by> element of a PIDF-LO.

   The schema for the provided-by schema used by this document is
   specified in Section 6.6.

9.4.  MIME Registrations

9.4.1.  MIME Content-type Registration for 'application/
        emergencyCallData.ProviderInfo+xml'

   This specification requests the registration of a new MIME type
   according to the procedures of RFC 4288 [RFC4288] and guidelines in
   RFC 3023 [RFC3023].

      MIME media type name: application

      MIME subtype name: emergencyCallData.ProviderInfo+xml

      Mandatory parameters: none

      Optional parameters: charset Indicates the character encoding of
      enclosed XML.

      Encoding considerations: Uses XML, which can employ 8-bit
      characters, depending on the character encoding used.  See
      Section 3.2 of RFC 3023 [RFC3023].

      Security considerations: This content type is designed to carry
      the data provider information, which is a sub-category of
      additional data about an emergency call.  Since this data contains
      personal information appropriate precautions have to be taken to
      limit unauthorized access, inappropriate disclosure to third
      parties, and eavesdropping of this information.  Please refer to
      Section 7 and Section 8 for more information.

      Interoperability considerations: None

      Published specification: [TBD: This specification]

      Applications which use this media type: Emergency Services

      Additional information: Magic Number: None File Extension: .xml
      Macintosh file type code: 'TEXT'

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      Person and email address for further information: Hannes
      Tschofenig, Hannes.Tschofenig@gmx.net

      Intended usage: LIMITED USE

      Author: This specification is a work item of the IETF ECRIT
      working group, with mailing list address <ecrit@ietf.org>.

      Change controller: The IESG <ietf@ietf.org>

9.4.2.  MIME Content-type Registration for 'application/
        emergencyCallData.ServiceInfo+xml'

   This specification requests the registration of a new MIME type
   according to the procedures of RFC 4288 [RFC4288] and guidelines in
   RFC 3023 [RFC3023].

      MIME media type name: application

      MIME subtype name: emergencyCallData.ServiceInfo+xml

      Mandatory parameters: none

      Optional parameters: charset Indicates the character encoding of
      enclosed XML.

      Encoding considerations: Uses XML, which can employ 8-bit
      characters, depending on the character encoding used.  See
      Section 3.2 of RFC 3023 [RFC3023].

      Security considerations: This content type is designed to carry
      the service information, which is a sub-category of additional
      data about an emergency call.  Since this data contains personal
      information appropriate precautions have to be taken to limit
      unauthorized access, inappropriate disclosure to third parties,
      and eavesdropping of this information.  Please refer to Section 7
      and Section 8 for more information.

      Interoperability considerations: None

      Published specification: [TBD: This specification]

      Applications which use this media type: Emergency Services

      Additional information: Magic Number: None File Extension: .xml
      Macintosh file type code: 'TEXT'

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      Person and email address for further information: Hannes
      Tschofenig, Hannes.Tschofenig@gmx.net

      Intended usage: LIMITED USE

      Author: This specification is a work item of the IETF ECRIT
      working group, with mailing list address <ecrit@ietf.org>.

      Change controller: The IESG <ietf@ietf.org>

9.4.3.  MIME Content-type Registration for 'application/
        emergencyCallData.DeviceInfo+xml'

   This specification requests the registration of a new MIME type
   according to the procedures of RFC 4288 [RFC4288] and guidelines in
   RFC 3023 [RFC3023].

      MIME media type name: application

      MIME subtype name: emergencyCallData.DeviceInfo+xml

      Mandatory parameters: none

      Optional parameters: charset Indicates the character encoding of
      enclosed XML.

      Encoding considerations: Uses XML, which can employ 8-bit
      characters, depending on the character encoding used.  See
      Section 3.2 of RFC 3023 [RFC3023].

      Security considerations: This content type is designed to carry
      the device information information, which is a sub-category of
      additional data about an emergency call.  Since this data contains
      personal information appropriate precautions have to be taken to
      limit unauthorized access, inappropriate disclosure to third
      parties, and eavesdropping of this information.  Please refer to
      Section 7 and Section 8 for more information.

      Interoperability considerations: None

      Published specification: [TBD: This specification]

      Applications which use this media type: Emergency Services

      Additional information: Magic Number: None File Extension: .xml
      Macintosh file type code: 'TEXT'

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      Person and email address for further information: Hannes
      Tschofenig, Hannes.Tschofenig@gmx.net

      Intended usage: LIMITED USE

      Author: This specification is a work item of the IETF ECRIT
      working group, with mailing list address <ecrit@ietf.org>.

      Change controller: The IESG <ietf@ietf.org>

9.4.4.  MIME Content-type Registration for 'application/
        emergencyCallData.SubscriberInfo+xml'

   This specification requests the registration of a new MIME type
   according to the procedures of RFC 4288 [RFC4288] and guidelines in
   RFC 3023 [RFC3023].

      MIME media type name: application

      MIME subtype name: emergencyCallData.SubscriberInfo+xml

      Mandatory parameters: none

      Optional parameters: charset Indicates the character encoding of
      enclosed XML.

      Encoding considerations: Uses XML, which can employ 8-bit
      characters, depending on the character encoding used.  See
      Section 3.2 of RFC 3023 [RFC3023].

      Security considerations: This content type is designed to carry
      owner/subscriber information, which is a sub-category of
      additional data about an emergency call.  Since this data contains
      personal information appropriate precautions have to be taken to
      limit unauthorized access, inappropriate disclosure to third
      parties, and eavesdropping of this information.  Please refer to
      Section 7 and Section 8 for more information.

      Interoperability considerations: None

      Published specification: [TBD: This specification]

      Applications which use this media type: Emergency Services

      Additional information: Magic Number: None File Extension: .xml
      Macintosh file type code: 'TEXT'

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      Person and email address for further information: Hannes
      Tschofenig, Hannes.Tschofenig@gmx.net

      Intended usage: LIMITED USE

      Author: This specification is a work item of the IETF ECRIT
      working group, with mailing list address <ecrit@ietf.org>.

      Change controller: The IESG <ietf@ietf.org>

9.4.5.  MIME Content-type Registration for 'application/
        emergencyCallData.Comment+xml'

   This specification requests the registration of a new MIME type
   according to the procedures of RFC 4288 [RFC4288] and guidelines in
   RFC 3023 [RFC3023].

      MIME media type name: application

      MIME subtype name: emergencyCallData.Comment+xml

      Mandatory parameters: none

      Optional parameters: charset Indicates the character encoding of
      enclosed XML.

      Encoding considerations: Uses XML, which can employ 8-bit
      characters, depending on the character encoding used.  See
      Section 3.2 of RFC 3023 [RFC3023].

      Security considerations: This content type is designed to carry a
      comment, which is a sub-category of additional data about an
      emergency call.  This data may contain personal information.
      Appropriate precautions may have to be taken to limit unauthorized
      access, inappropriate disclosure to third parties, and
      eavesdropping of this information.  Please refer to Section 7 and
      Section 8 for more information.

      Interoperability considerations: None

      Published specification: [TBD: This specification]

      Applications which use this media type: Emergency Services

      Additional information: Magic Number: None File Extension: .xml
      Macintosh file type code: 'TEXT'

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      Person and email address for further information: Hannes
      Tschofenig, Hannes.Tschofenig@gmx.net

      Intended usage: LIMITED USE

      Author: This specification is a work item of the IETF ECRIT
      working group, with mailing list address <ecrit@ietf.org>.

      Change controller: The IESG <ietf@ietf.org>

9.5.  URN Sub-Namespace Registration

9.5.1.  Registration for urn:ietf:params:xml:ns:emergencycalldata

   This section registers a new XML namespace, as per the guidelines in
   RFC 3688 [RFC3688].

   URI:  urn:ietf:params:xml:ns:emergencycalldata

   Registrant Contact:  IETF, ECRIT working group, <ecrit@ietf.org>, as
      delegated by the IESG <iesg@ietf.org>.

   XML:

      BEGIN
      <?xml version="1.0"?>
      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
        "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
      <html xmlns="http://www.w3.org/1999/xhtml">
      <head>
        <meta http-equiv="content-type"
              content="text/html;charset=iso-8859-1"/>
        <title>Namespace for Additional Emergency Call Data</title>
      </head>
      <body>
        <h1>Namespace for Additional Data related to an Emergency Call</h1>
      <p>See [TBD: This document].</p>
      </body>
      </html>
      END

9.5.2.  Registration for
        urn:ietf:params:xml:ns:emergencycalldata:providerinfo

   This section registers a new XML namespace, as per the guidelines in
   RFC 3688 [RFC3688].

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   URI:  urn:ietf:params:xml:ns:emergencycalldata:providerinfo

   Registrant Contact:  IETF, ECRIT working group, <ecrit@ietf.org>, as
      delegated by the IESG <iesg@ietf.org>.

   XML:

      BEGIN
      <?xml version="1.0"?>
      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
        "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
      <html xmlns="http://www.w3.org/1999/xhtml">
      <head>
        <meta http-equiv="content-type"
              content="text/html;charset=iso-8859-1"/>
        <title>Namespace for Additional Emergency Call Data:
               Data Provider Information</title>
      </head>
      <body>
        <h1>Namespace for Additional Data related to an Emergency Call</h1>
        <h2>Data Provider Information</h2>
      <p>See [TBD: This document].</p>
      </body>
      </html>
      END

9.5.3.  Registration for
        urn:ietf:params:xml:ns:emergencycalldata:ServiceInfo

   This section registers a new XML namespace, as per the guidelines in
   RFC 3688 [RFC3688].

   URI:  urn:ietf:params:xml:ns:emergencycalldata:ServiceInfo

   Registrant Contact:  IETF, ECRIT working group, <ecrit@ietf.org>, as
      delegated by the IESG <iesg@ietf.org>.

   XML:

      BEGIN
      <?xml version="1.0"?>
      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
        "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
      <html xmlns="http://www.w3.org/1999/xhtml">
      <head>

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        <meta http-equiv="content-type"
              content="text/html;charset=iso-8859-1"/>
        <title>Namespace for Additional Emergency Call Data:
               Service Information</title>
      </head>
      <body>
        <h1>Namespace for Additional Data related to an Emergency Call</h1>
        <h2>Service Information</h2>
      <p>See [TBD: This document].</p>
      </body>
      </html>
      END

9.5.4.  Registration for
        urn:ietf:params:xml:ns:emergencycalldata:DeviceInfo

   This section registers a new XML namespace, as per the guidelines in
   RFC 3688 [RFC3688].

   URI:  urn:ietf:params:xml:ns:emergencycalldata:DeviceInfo

   Registrant Contact:  IETF, ECRIT working group, <ecrit@ietf.org>, as
      delegated by the IESG <iesg@ietf.org>.

   XML:

      BEGIN
      <?xml version="1.0"?>
      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
        "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
      <html xmlns="http://www.w3.org/1999/xhtml">
      <head>
        <meta http-equiv="content-type"
              content="text/html;charset=iso-8859-1"/>
        <title>Namespace for Additional Emergency Call Data:
               Device Information</title>
      </head>
      <body>
        <h1>Namespace for Additional Data related to an Emergency Call</h1>
        <h2>Device Information</h2>
      <p>See [TBD: This document].</p>
      </body>
      </html>
      END

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9.5.5.  Registration for
        urn:ietf:params:xml:ns:emergencycalldata:SubscriberInfo

   This section registers a new XML namespace, as per the guidelines in
   RFC 3688 [RFC3688].

   URI:  urn:ietf:params:xml:ns:emergencycalldata:SubscriberInfo

   Registrant Contact:  IETF, ECRIT working group, <ecrit@ietf.org>, as
      delegated by the IESG <iesg@ietf.org>.

   XML:

      BEGIN
      <?xml version="1.0"?>
      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
        "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
      <html xmlns="http://www.w3.org/1999/xhtml">
      <head>
        <meta http-equiv="content-type"
              content="text/html;charset=iso-8859-1"/>
        <title>Namespace for Additional Emergency Call Data:
               Owner/Subscriber Information</title>
      </head>
      <body>
        <h1>Namespace for Additional Data related to an Emergency Call</h1>
        <h2> Owner/Subscriber Information</h2>
      <p>See [TBD: This document].</p>
      </body>
      </html>
      END

9.5.6.  Registration for
        urn:ietf:params:xml:ns:emergencycalldata:comment

   This section registers a new XML namespace, as per the guidelines in
   RFC 3688 [RFC3688].

   URI:  urn:ietf:params:xml:ns:emergencycalldata:comment

   Registrant Contact:  IETF, ECRIT working group, <ecrit@ietf.org>, as
      delegated by the IESG <iesg@ietf.org>.

   XML:

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      BEGIN
      <?xml version="1.0"?>
      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
        "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
      <html xmlns="http://www.w3.org/1999/xhtml">
      <head>
        <meta http-equiv="content-type"
              content="text/html;charset=iso-8859-1"/>
        <title>Namespace for Additional Emergency Call Data:Comment</title>
      </head>
      <body>
        <h1>Namespace for Additional Data related to an Emergency Call</h1>
        <h2> Comment</h2>
      <p>See [TBD: This document].</p>
      </body>
      </html>
      END

9.6.  Schema Registrations

   This specification registers five schemas, as per the guidelines in
   RFC 3688 [RFC3688].

      URI: urn:ietf:params:xml:schema:emergencycalldata:providerinfo

      Registrant Contact: IETF, ECRIT Working Group (ecrit@ietf.org), as
      delegated by the IESG (iesg@ietf.org).

      XML: The XML schema can be found in Figure 15.

      URI: urn:ietf:params:xml:schema:emergencycalldata:ServiceInfo

      Registrant Contact: IETF, ECRIT Working Group (ectit@ietf.org), as
      delegated by the IESG (iesg@ietf.org).

      XML: The XML schema can be found in Figure 16.

      URI: urn:ietf:params:xml:schema:emergencycalldata:DeviceInfo

      Registrant Contact: IETF, ECRIT Working Group (ecrit@ietf.org), as
      delegated by the IESG (iesg@ietf.org).

      XML: The XML schema can be found in Figure 17.

      URI: urn:ietf:params:xml:schema:emergencycalldata:SubscriberInfo

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      Registrant Contact: IETF, ECRIT Working Group (ecrit@ietf.org), as
      delegated by the IESG (iesg@ietf.org).

      XML: The XML schema can be found in Section 6.4.

      URI: urn:ietf:params:xml:schema:emergencycalldata:comment

      Registrant Contact: IETF, ECRIT Working Group (ecrit@ietf.org), as
      delegated by the IESG (iesg@ietf.org).

      XML: The XML schema can be found in Section 6.5.

9.7.  VCard Parameter Value Registration

   This document registers a new value in the vCARD Parameter Values
   registry as defined by [RFC6350] with the following template:

   Value:  main

   Purpose:  The main telephone number, typically of an enterprise, as
      opposed to a direct dial number of an individual employee

   Conformance:  This value can be used with the "TYPE" parameter
      applied on the "TEL" property.

   Example(s):  TEL;VALUE=uri;TYPE="main,voice";PREF=1:tel:+1-418-656-90
      00

10.  Acknowledgments

   This work was originally started in NENA and has benefitted from a
   large number of participants in NENA standardization efforts,
   originally in the Long Term Definition Working Group, the Data
   Technical Committee and most recently the Additional Data working
   group.  The authors are grateful for the initial work and extended
   comments provided by many NENA participants, including Delaine
   Arnold, Marc Berryman, Guy Caron, Mark Fletcher, Brian Dupras, James
   Leyerle, Kathy McMahon, Christian, Militeau, Ira Pyles, Matt Serra,
   and Robert (Bob) Sherry.

   We would also like to thank Paul Kyzivat, Gunnar Hellstrom, Martin
   Thomson, Keith Drage, Laura Liess, and Barbara Stark for their review
   comments.

11.  References

11.1.  Normative References

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   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2392]  Levinson, E., "Content-ID and Message-ID Uniform Resource
              Locators", RFC 2392, August 1998.

   [RFC3023]  Murata, M., St. Laurent, S., and D. Kohn, "XML Media
              Types", RFC 3023, January 2001.

   [RFC3204]  Zimmerer, E., Peterson, J., Vemuri, A., Ong, L., Audet,
              F., Watson, M., and M. Zonoun, "MIME media types for ISUP
              and QSIG Objects", RFC 3204, December 2001.

   [RFC3261]  Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,
              A., Peterson, J., Sparks, R., Handley, M., and E.
              Schooler, "SIP: Session Initiation Protocol", RFC 3261,
              June 2002.

   [RFC3325]  Jennings, C., Peterson, J., and M. Watson, "Private
              Extensions to the Session Initiation Protocol (SIP) for
              Asserted Identity within Trusted Networks", RFC 3325,
              November 2002.

   [RFC3459]  Burger, E., "Critical Content Multi-purpose Internet Mail
              Extensions (MIME) Parameter", RFC 3459, January 2003.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              January 2004.

   [RFC4119]  Peterson, J., "A Presence-based GEOPRIV Location Object
              Format", RFC 4119, December 2005.

   [RFC4288]  Freed, N. and J. Klensin, "Media Type Specifications and
              Registration Procedures", RFC 4288, December 2005.

   [RFC5226]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", BCP 26, RFC 5226,
              May 2008.

   [RFC5621]  Camarillo, G., "Message Body Handling in the Session
              Initiation Protocol (SIP)", RFC 5621, September 2009.

   [RFC6350]  Perreault, S., "vCard Format Specification", RFC 6350,
              August 2011.

   [RFC6351]  Perreault, S., "xCard: vCard XML Representation", RFC
              6351, August 2011.

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11.2.  Informational References

   [I-D.gellens-negotiating-human-language]
              Randy, R., "Negotiating Human Language Using SDP", draft-
              gellens-negotiating-human-language-02 (work in progress),
              February 2013.

   [I-D.ietf-ecrit-psap-callback]
              Schulzrinne, H., Tschofenig, H., Holmberg, C., and M.
              Patel, "Public Safety Answering Point (PSAP) Callback",
              draft-ietf-ecrit-psap-callback-13 (work in progress),
              October 2013.

   [I-D.ietf-geopriv-relative-location]
              Thomson, M., Rosen, B., Stanley, D., Bajko, G., and A.
              Thomson, "Relative Location Representation", draft-ietf-
              geopriv-relative-location-08 (work in progress), September
              2013.

   [RFC3840]  Rosenberg, J., Schulzrinne, H., and P. Kyzivat,
              "Indicating User Agent Capabilities in the Session
              Initiation Protocol (SIP)", RFC 3840, August 2004.

   [RFC5012]  Schulzrinne, H. and R. Marshall, "Requirements for
              Emergency Context Resolution with Internet Technologies",
              RFC 5012, January 2008.

   [RFC5139]  Thomson, M. and J. Winterbottom, "Revised Civic Location
              Format for Presence Information Data Format Location
              Object (PIDF-LO)", RFC 5139, February 2008.

   [RFC5222]  Hardie, T., Newton, A., Schulzrinne, H., and H.
              Tschofenig, "LoST: A Location-to-Service Translation
              Protocol", RFC 5222, August 2008.

   [RFC5491]  Winterbottom, J., Thomson, M., and H. Tschofenig, "GEOPRIV
              Presence Information Data Format Location Object (PIDF-LO)
              Usage Clarification, Considerations, and Recommendations",
              RFC 5491, March 2009.

   [RFC5962]  Schulzrinne, H., Singh, V., Tschofenig, H., and M.
              Thomson, "Dynamic Extensions to the Presence Information
              Data Format Location Object (PIDF-LO)", RFC 5962,
              September 2010.

   [RFC5985]  Barnes, M., "HTTP-Enabled Location Delivery (HELD)", RFC
              5985, September 2010.

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   [RFC6443]  Rosen, B., Schulzrinne, H., Polk, J., and A. Newton,
              "Framework for Emergency Calling Using Internet
              Multimedia", RFC 6443, December 2011.

   [RFC6848]  Winterbottom, J., Thomson, M., Barnes, R., Rosen, B., and
              R. George, "Specifying Civic Address Extensions in the
              Presence Information Data Format Location Object (PIDF-
              LO)", RFC 6848, January 2013.

   [RFC6881]  Rosen, B. and J. Polk, "Best Current Practice for
              Communications Services in Support of Emergency Calling",
              BCP 181, RFC 6881, March 2013.

   [RFC6973]  Cooper, A., Tschofenig, H., Aboba, B., Peterson, J.,
              Morris, J., Hansen, M., and R. Smith, "Privacy
              Considerations for Internet Protocols", RFC 6973, July
              2013.

Appendix A.  XML Schema for vCard/xCard

   This section contains the vCard/xCard XML schema version of the Relax
   NG schema defined in RFC 6351 [RFC6351] for simplified use with the
   XML schemas defined in this document.  The schema in RFC 6351
   [RFC6351] is the normative source and this section is informative
   only.

   <?xml version="1.0" encoding="UTF-8"?>
   <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
   elementFormDefault="qualified"
   targetNamespace="urn:ietf:params:xml:ns:vcard-4.0"
   xmlns:ns1="urn:ietf:params:xml:ns:vcard-4.0">
     <!--

       3.3
       iana-token = xsd:string { pattern = "[a-zA-Z0-9-]+" }
       x-name = xsd:string { pattern = "x-[a-zA-Z0-9-]+" }
     -->
     <xs:simpleType name="iana-token">
       <xs:annotation>
         <xs:documentation>vCard Format Specification
         </xs:documentation>
       </xs:annotation>
       <xs:restriction base="xs:string"/>
     </xs:simpleType>
     <xs:simpleType name="x-name">
       <xs:restriction base="xs:string"/>
     </xs:simpleType>

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     <!--

       4.1
     -->
     <xs:element name="text" type="xs:string"/>
     <xs:group name="value-text-list">
       <xs:sequence>
         <xs:element maxOccurs="unbounded" ref="ns1:text"/>
       </xs:sequence>
     </xs:group>
     <!-- 4.2 -->
     <xs:element name="uri" type="xs:anyURI"/>
     <!-- 4.3.1 -->
     <xs:element name="date"
     substitutionGroup="ns1:value-date-and-or-time">
       <xs:simpleType>
         <xs:restriction base="xs:string">
           <xs:pattern value="\d{8}|\d{4}-\d\d|
           --\d\d(\d\d)?|---\d\d"/>
         </xs:restriction>
       </xs:simpleType>
     </xs:element>
     <!-- 4.3.2 -->
     <xs:element name="time"
     substitutionGroup="ns1:value-date-and-or-time">
       <xs:simpleType>
         <xs:restriction base="xs:string">
           <xs:pattern value="(\d\d(\d\d(\d\d)?)?|-\d\d(\d\d?)|--\d\d)
           (Z|[+\-]\d\d(\d\d)?)?"/>
         </xs:restriction>
       </xs:simpleType>
     </xs:element>
     <!-- 4.3.3 -->
     <xs:element name="date-time"
     substitutionGroup="ns1:value-date-and-or-time">
       <xs:simpleType>
         <xs:restriction base="xs:string">
           <xs:pattern value=
           "(\d{8}|--\d{4}|---\d\d)T
           \d\d(\d\d(\d\d)?)?(Z|[+\-]\d\d(\d\d)?)?"/>
         </xs:restriction>
       </xs:simpleType>
     </xs:element>
     <!-- 4.3.4 -->
     <xs:element name="value-date-and-or-time" abstract="true"/>
     <!-- 4.3.5 -->
     <xs:complexType name="value-timestamp">
       <xs:sequence>

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         <xs:element ref="ns1:timestamp"/>
       </xs:sequence>
     </xs:complexType>
     <xs:element name="timestamp">
       <xs:simpleType>
         <xs:restriction base="xs:string">
           <xs:pattern value="\d{8}T\d{6}(Z|[+\-]\d\d(\d\d)?)?"/>
         </xs:restriction>
       </xs:simpleType>
     </xs:element>
     <!-- 4.4 -->
     <xs:element name="boolean" type="xs:boolean"/>
     <!-- 4.5 -->
     <xs:element name="integer" type="xs:integer"/>
     <!-- 4.6 -->
     <xs:element name="float" type="xs:float"/>
     <!-- 4.7 -->
     <xs:element name="utc-offset">
       <xs:simpleType>
         <xs:restriction base="xs:string">
           <xs:pattern value="[+\-]\d\d(\d\d)?"/>
         </xs:restriction>
       </xs:simpleType>
     </xs:element>
     <!-- 4.8 -->
     <xs:element name="language-tag">
       <xs:simpleType>
         <xs:restriction base="xs:string">
           <xs:pattern
           value="([a-z]{2,3}((-[a-z]{3}){0,3})?|[a-z]{4,8})
           (-[a-z]{4})?(-([a-z]{2}|\d{3}))?(-([0-9a-z]{5,8}|
           \d[0-9a-z]{3}))*(-[0-9a-wyz](-[0-9a-z]{2,8})+)*
           (-x(-[0-9a-z]{1,8})+)?|x(-[0-9a-z]{1,8})+|[a-z]{1,3}
           (-[0-9a-z]{2,8}){1,2}"/>
         </xs:restriction>
       </xs:simpleType>
     </xs:element>
     <!--

       5.1
     -->
     <xs:group name="param-language">
       <xs:annotation>
         <xs:documentation>Section 5: Parameters</xs:documentation>
       </xs:annotation>
       <xs:sequence>
         <xs:element minOccurs="0" ref="ns1:language"/>
       </xs:sequence>

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     </xs:group>
     <xs:element name="language">
       <xs:complexType>
         <xs:sequence>
           <xs:element ref="ns1:language-tag"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 5.2 -->
     <xs:group name="param-pref">
       <xs:sequence>
         <xs:element minOccurs="0" ref="ns1:pref"/>
       </xs:sequence>
     </xs:group>
     <xs:element name="pref">
       <xs:complexType>
         <xs:sequence>
           <xs:element name="integer">
             <xs:simpleType>
               <xs:restriction base="xs:integer">
                 <xs:minInclusive value="1"/>
                 <xs:maxInclusive value="100"/>
               </xs:restriction>
             </xs:simpleType>
           </xs:element>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 5.4 -->
     <xs:group name="param-altid">
       <xs:sequence>
         <xs:element minOccurs="0" ref="ns1:altid"/>
       </xs:sequence>
     </xs:group>
     <xs:element name="altid">
       <xs:complexType>
         <xs:sequence>
           <xs:element ref="ns1:text"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 5.5 -->
     <xs:group name="param-pid">
       <xs:sequence>
         <xs:element minOccurs="0" ref="ns1:pid"/>
       </xs:sequence>
     </xs:group>
     <xs:element name="pid">

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       <xs:complexType>
         <xs:sequence>
           <xs:element maxOccurs="unbounded" name="text">
             <xs:simpleType>
               <xs:restriction base="xs:string">
                 <xs:pattern value="\d+(\.\d+)?"/>
               </xs:restriction>
             </xs:simpleType>
           </xs:element>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 5.6 -->
     <xs:group name="param-type">
       <xs:sequence>
         <xs:element minOccurs="0" ref="ns1:type"/>
       </xs:sequence>
     </xs:group>
     <xs:element name="type">
       <xs:complexType>
         <xs:sequence>
           <xs:element maxOccurs="unbounded" name="text">
             <xs:simpleType>
               <xs:restriction base="xs:token">
                 <xs:enumeration value="work"/>
                 <xs:enumeration value="home"/>
               </xs:restriction>
             </xs:simpleType>
           </xs:element>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 5.7 -->
     <xs:group name="param-mediatype">
       <xs:sequence>
         <xs:element minOccurs="0" ref="ns1:mediatype"/>
       </xs:sequence>
     </xs:group>
     <xs:element name="mediatype">
       <xs:complexType>
         <xs:sequence>
           <xs:element ref="ns1:text"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 5.8 -->
     <xs:group name="param-calscale">
       <xs:sequence>

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         <xs:element minOccurs="0" ref="ns1:calscale"/>
       </xs:sequence>
     </xs:group>
     <xs:element name="calscale">
       <xs:complexType>
         <xs:sequence>
           <xs:element name="text">
             <xs:simpleType>
               <xs:restriction base="xs:token">
                 <xs:enumeration value="gregorian"/>
               </xs:restriction>
             </xs:simpleType>
           </xs:element>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 5.9 -->
     <xs:group name="param-sort-as">
       <xs:sequence>
         <xs:element minOccurs="0" ref="ns1:sort-as"/>
       </xs:sequence>
     </xs:group>
     <xs:element name="sort-as">
       <xs:complexType>
         <xs:sequence>
           <xs:element maxOccurs="unbounded" ref="ns1:text"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 5.10 -->
     <xs:group name="param-geo">
       <xs:sequence>
         <xs:element minOccurs="0" name="geo">
           <xs:complexType>
             <xs:sequence>
               <xs:element ref="ns1:uri"/>
             </xs:sequence>
           </xs:complexType>
         </xs:element>
       </xs:sequence>
     </xs:group>
     <!-- 5.11 -->
     <xs:group name="param-tz">
       <xs:sequence>
         <xs:element minOccurs="0" name="tz">
           <xs:complexType>
             <xs:choice>
               <xs:element ref="ns1:text"/>

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               <xs:element ref="ns1:uri"/>
             </xs:choice>
           </xs:complexType>
         </xs:element>
       </xs:sequence>
     </xs:group>
     <!--

       6.1.3
     -->
     <xs:element name="source">
       <xs:complexType>
         <xs:sequence>
           <xs:element name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-mediatype"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:uri"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.1.4 -->
     <xs:element name="kind">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" maxOccurs="unbounded" name="text">
             <xs:simpleType>
               <xs:union memberTypes="ns1:x-name ns1:iana-token">
                 <xs:simpleType>
                   <xs:restriction base="xs:token">
                     <xs:enumeration value="individual"/>
                   </xs:restriction>
                 </xs:simpleType>
                 <xs:simpleType>
                   <xs:restriction base="xs:token">
                     <xs:enumeration value="group"/>
                   </xs:restriction>
                 </xs:simpleType>
                 <xs:simpleType>
                   <xs:restriction base="xs:token">
                     <xs:enumeration value="org"/>
                   </xs:restriction>

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                 </xs:simpleType>
                 <xs:simpleType>
                   <xs:restriction base="xs:token">
                     <xs:enumeration value="location"/>
                   </xs:restriction>
                 </xs:simpleType>
               </xs:union>
             </xs:simpleType>
           </xs:element>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.2.1 -->
     <xs:element name="fn">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-language"/>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:text"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.2.2 -->
     <xs:element name="n">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-language"/>
                 <xs:group ref="ns1:param-sort-as"/>
                 <xs:group ref="ns1:param-altid"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element maxOccurs="unbounded" ref="ns1:surname"/>
           <xs:element maxOccurs="unbounded" ref="ns1:given"/>
           <xs:element maxOccurs="unbounded" ref="ns1:additional"/>
           <xs:element maxOccurs="unbounded" ref="ns1:prefix"/>

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           <xs:element maxOccurs="unbounded" ref="ns1:suffix"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <xs:element name="surname" type="xs:string"/>
     <xs:element name="given" type="xs:string"/>
     <xs:element name="additional" type="xs:string"/>
     <xs:element name="prefix" type="xs:string"/>
     <xs:element name="suffix" type="xs:string"/>
     <!-- 6.2.3 -->
     <xs:element name="nickname">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-language"/>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:group ref="ns1:value-text-list"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.2.4 -->
     <xs:element name="photo">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
                 <xs:group ref="ns1:param-mediatype"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:uri"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.2.5 -->

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     <xs:element name="bday">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-calscale"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:choice>
             <xs:element ref="ns1:value-date-and-or-time"/>
             <xs:element ref="ns1:text"/>
           </xs:choice>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.2.6 -->
     <xs:element name="anniversary">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-calscale"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:choice>
             <xs:element ref="ns1:value-date-and-or-time"/>
             <xs:element ref="ns1:text"/>
           </xs:choice>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.2.7 -->
     <xs:element name="gender">
       <xs:complexType>
         <xs:sequence>
           <xs:element ref="ns1:sex"/>
           <xs:element minOccurs="0" ref="ns1:identity"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <xs:element name="sex">
       <xs:simpleType>

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         <xs:restriction base="xs:token">
           <xs:enumeration value=""/>
           <xs:enumeration value="M"/>
           <xs:enumeration value="F"/>
           <xs:enumeration value="O"/>
           <xs:enumeration value="N"/>
           <xs:enumeration value="U"/>
         </xs:restriction>
       </xs:simpleType>
     </xs:element>
     <xs:element name="identity" type="xs:string"/>
     <!-- 6.3.1 -->
     <xs:group name="param-label">
       <xs:sequence>
         <xs:element minOccurs="0" ref="ns1:label"/>
       </xs:sequence>
     </xs:group>
     <xs:element name="label">
       <xs:complexType>
         <xs:sequence>
           <xs:element ref="ns1:text"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <xs:element name="adr">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-language"/>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
                 <xs:group ref="ns1:param-geo"/>
                 <xs:group ref="ns1:param-tz"/>
                 <xs:group ref="ns1:param-label"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element maxOccurs="unbounded" ref="ns1:pobox"/>
           <xs:element maxOccurs="unbounded" ref="ns1:ext"/>
           <xs:element maxOccurs="unbounded" ref="ns1:street"/>
           <xs:element maxOccurs="unbounded" ref="ns1:locality"/>
           <xs:element maxOccurs="unbounded" ref="ns1:region"/>
           <xs:element maxOccurs="unbounded" ref="ns1:code"/>
           <xs:element maxOccurs="unbounded" ref="ns1:country"/>

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         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <xs:element name="pobox" type="xs:string"/>
     <xs:element name="ext" type="xs:string"/>
     <xs:element name="street" type="xs:string"/>
     <xs:element name="locality" type="xs:string"/>
     <xs:element name="region" type="xs:string"/>
     <xs:element name="code" type="xs:string"/>
     <xs:element name="country" type="xs:string"/>
     <!-- 6.4.1 -->
     <xs:element name="tel">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:element minOccurs="0" name="type">
                   <xs:complexType>
                     <xs:sequence>
                       <xs:element maxOccurs="unbounded" name="text">
                         <xs:simpleType>
                           <xs:restriction base="xs:token">
                             <xs:enumeration value="work"/>
                             <xs:enumeration value="home"/>
                             <xs:enumeration value="text"/>
                             <xs:enumeration value="voice"/>
                             <xs:enumeration value="fax"/>
                             <xs:enumeration value="cell"/>
                             <xs:enumeration value="video"/>
                             <xs:enumeration value="pager"/>
                             <xs:enumeration value="textphone"/>
                           </xs:restriction>
                         </xs:simpleType>
                       </xs:element>
                     </xs:sequence>
                   </xs:complexType>
                 </xs:element>
                 <xs:group ref="ns1:param-mediatype"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:choice>
             <xs:element ref="ns1:text"/>
             <xs:element ref="ns1:uri"/>

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           </xs:choice>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.4.2 -->
     <xs:element name="email">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:text"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.4.3 -->
     <xs:element name="impp">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
                 <xs:group ref="ns1:param-mediatype"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:uri"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.4.4 -->
     <xs:element name="lang">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>

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                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:language-tag"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.5.1 -->
     <xs:group name="property-tz">
       <xs:sequence>
         <xs:element name="tz">
           <xs:complexType>
             <xs:sequence>
               <xs:element minOccurs="0" name="parameters">
                 <xs:complexType>
                   <xs:sequence>
                     <xs:group ref="ns1:param-altid"/>
                     <xs:group ref="ns1:param-pid"/>
                     <xs:group ref="ns1:param-pref"/>
                     <xs:group ref="ns1:param-type"/>
                     <xs:group ref="ns1:param-mediatype"/>
                   </xs:sequence>
                 </xs:complexType>
               </xs:element>
               <xs:choice>
                 <xs:element ref="ns1:text"/>
                 <xs:element ref="ns1:uri"/>
                 <xs:element ref="ns1:utc-offset"/>
               </xs:choice>
             </xs:sequence>
           </xs:complexType>
         </xs:element>
       </xs:sequence>
     </xs:group>
     <!-- 6.5.2 -->
     <xs:group name="property-geo">
       <xs:sequence>
         <xs:element name="geo">
           <xs:complexType>
             <xs:sequence>
               <xs:element minOccurs="0" name="parameters">
                 <xs:complexType>
                   <xs:sequence>
                     <xs:group ref="ns1:param-altid"/>

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                     <xs:group ref="ns1:param-pid"/>
                     <xs:group ref="ns1:param-pref"/>
                     <xs:group ref="ns1:param-type"/>
                     <xs:group ref="ns1:param-mediatype"/>
                   </xs:sequence>
                 </xs:complexType>
               </xs:element>
               <xs:element ref="ns1:uri"/>
             </xs:sequence>
           </xs:complexType>
         </xs:element>
       </xs:sequence>
     </xs:group>
     <!-- 6.6.1 -->
     <xs:element name="title">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-language"/>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:text"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.6.2 -->
     <xs:element name="role">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-language"/>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:text"/>

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         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.6.3 -->
     <xs:element name="logo">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-language"/>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
                 <xs:group ref="ns1:param-mediatype"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:uri"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.6.4 -->
     <xs:element name="org">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-language"/>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
                 <xs:group ref="ns1:param-sort-as"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:group ref="ns1:value-text-list"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.6.5 -->
     <xs:element name="member">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">

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             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-mediatype"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:uri"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.6.6 -->
     <xs:element name="related">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:element minOccurs="0" name="type">
                   <xs:complexType>
                     <xs:sequence>
                       <xs:element maxOccurs="unbounded" name="text">
                         <xs:simpleType>
                           <xs:restriction base="xs:token">
                             <xs:enumeration value="work"/>
                             <xs:enumeration value="home"/>
                             <xs:enumeration value="contact"/>
                             <xs:enumeration value="acquaintance"/>
                             <xs:enumeration value="friend"/>
                             <xs:enumeration value="met"/>
                             <xs:enumeration value="co-worker"/>
                             <xs:enumeration value="colleague"/>
                             <xs:enumeration value="co-resident"/>
                             <xs:enumeration value="neighbor"/>
                             <xs:enumeration value="child"/>
                             <xs:enumeration value="parent"/>
                             <xs:enumeration value="sibling"/>
                             <xs:enumeration value="spouse"/>
                             <xs:enumeration value="kin"/>
                             <xs:enumeration value="muse"/>
                             <xs:enumeration value="crush"/>
                             <xs:enumeration value="date"/>
                             <xs:enumeration value="sweetheart"/>

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                             <xs:enumeration value="me"/>
                             <xs:enumeration value="agent"/>
                             <xs:enumeration value="emergency"/>
                           </xs:restriction>
                         </xs:simpleType>
                       </xs:element>
                     </xs:sequence>
                   </xs:complexType>
                 </xs:element>
                 <xs:group ref="ns1:param-mediatype"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:choice>
             <xs:element ref="ns1:uri"/>
             <xs:element ref="ns1:text"/>
           </xs:choice>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.7.1 -->
     <xs:element name="categories">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:group ref="ns1:value-text-list"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.7.2 -->
     <xs:element name="note">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-language"/>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>

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                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:text"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.7.3 -->
     <xs:element name="prodid">
       <xs:complexType>
         <xs:sequence>
           <xs:element ref="ns1:text"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.7.4 -->
     <xs:element name="rev" type="ns1:value-timestamp"/>
     <!-- 6.7.5 -->
     <xs:element name="sound">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-language"/>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
                 <xs:group ref="ns1:param-mediatype"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:uri"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.7.6 -->
     <xs:element name="uid">
       <xs:complexType>
         <xs:sequence>
           <xs:element ref="ns1:uri"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.7.7 -->

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     <xs:element name="clientpidmap">
       <xs:complexType>
         <xs:sequence>
           <xs:element ref="ns1:sourceid"/>
           <xs:element ref="ns1:uri"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <xs:element name="sourceid" type="xs:positiveInteger"/>
     <!-- 6.7.8 -->
     <xs:element name="url">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
                 <xs:group ref="ns1:param-mediatype"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:uri"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.8.1 -->
     <xs:element name="key">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
                 <xs:group ref="ns1:param-mediatype"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:choice>
             <xs:element ref="ns1:uri"/>
             <xs:element ref="ns1:text"/>
           </xs:choice>
         </xs:sequence>

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       </xs:complexType>
     </xs:element>
     <!-- 6.9.1 -->
     <xs:element name="fburl">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
                 <xs:group ref="ns1:param-mediatype"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:uri"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.9.2 -->
     <xs:element name="caladruri">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>
                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
                 <xs:group ref="ns1:param-mediatype"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:uri"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- 6.9.3 -->
     <xs:element name="caluri">
       <xs:complexType>
         <xs:sequence>
           <xs:element minOccurs="0" name="parameters">
             <xs:complexType>
               <xs:sequence>
                 <xs:group ref="ns1:param-altid"/>

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                 <xs:group ref="ns1:param-pid"/>
                 <xs:group ref="ns1:param-pref"/>
                 <xs:group ref="ns1:param-type"/>
                 <xs:group ref="ns1:param-mediatype"/>
               </xs:sequence>
             </xs:complexType>
           </xs:element>
           <xs:element ref="ns1:uri"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>
     <!-- Top-level grammar -->
     <xs:group name="property">
       <xs:choice>
         <xs:element ref="ns1:adr"/>
         <xs:element ref="ns1:anniversary"/>
         <xs:element ref="ns1:bday"/>
         <xs:element ref="ns1:caladruri"/>
         <xs:element ref="ns1:caluri"/>
         <xs:element ref="ns1:categories"/>
         <xs:element ref="ns1:clientpidmap"/>
         <xs:element ref="ns1:email"/>
         <xs:element ref="ns1:fburl"/>
         <xs:element ref="ns1:fn"/>
         <xs:group ref="ns1:property-geo"/>
         <xs:element ref="ns1:impp"/>
         <xs:element ref="ns1:key"/>
         <xs:element ref="ns1:kind"/>
         <xs:element ref="ns1:lang"/>
         <xs:element ref="ns1:logo"/>
         <xs:element ref="ns1:member"/>
         <xs:element ref="ns1:n"/>
         <xs:element ref="ns1:nickname"/>
         <xs:element ref="ns1:note"/>
         <xs:element ref="ns1:org"/>
         <xs:element ref="ns1:photo"/>
         <xs:element ref="ns1:prodid"/>
         <xs:element ref="ns1:related"/>
         <xs:element ref="ns1:rev"/>
         <xs:element ref="ns1:role"/>
         <xs:element ref="ns1:gender"/>
         <xs:element ref="ns1:sound"/>
         <xs:element ref="ns1:source"/>
         <xs:element ref="ns1:tel"/>
         <xs:element ref="ns1:title"/>
         <xs:group ref="ns1:property-tz"/>
         <xs:element ref="ns1:uid"/>
         <xs:element ref="ns1:url"/>

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       </xs:choice>
     </xs:group>

     <xs:element name="vcards">
       <xs:complexType>
         <xs:sequence>
           <xs:element maxOccurs="unbounded" ref="ns1:vcard"/>
         </xs:sequence>
       </xs:complexType>
     </xs:element>

     <xs:complexType name="vcardType">
       <xs:complexContent>
         <xs:restriction base="xs:anyType">
           <xs:choice maxOccurs="unbounded">
             <xs:group ref="ns1:property"/>
             <xs:element ref="ns1:group"/>
           </xs:choice>

         </xs:restriction>
       </xs:complexContent>
     </xs:complexType>

     <xs:element name="vcard"  type="ns1:vcardType"/>

     <xs:element name="group">
       <xs:complexType>
         <xs:group minOccurs="0" maxOccurs="unbounded"
         ref="ns1:property"/>
         <xs:attribute name="name" use="required"/>
       </xs:complexType>
     </xs:element>
   </xs:schema>

Authors' Addresses

   Brian Rosen
   NeuStar
   470 Conrad Dr.
   Mars, PA  16046
   US

   Phone: +1 724 382 1051
   Email: br@brianrosen.net

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   Hannes Tschofenig
   Nokia Solutions and Networks
   Linnoitustie 6
   Espoo  02600
   Finland

   Phone: +358 (50) 4871445
   Email: Hannes.Tschofenig@gmx.net
   URI:   http://www.tschofenig.priv.at

   Roger Marshall
   TeleCommunication Systems, Inc.
   2401 Elliott Avenue
   Seattle, WA  98121
   US

   Phone: +1 206 792 2424
   Email: rmarshall@telecomsys.com
   URI:   http://www.telecomsys.com

   Randall Gellens
   Qualcomm Technologies, Inc.
   5775 Morehouse Drive
   San Diego, CA  92121
   US

   Email: rg+ietf@qti.qualcomm.com

   James Winterbottom
   AU

   Email: a.james.winterbottom@gmail.com

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