ECRIT B. Rosen
Internet-Draft NeuStar
Intended status: Standards Track H. Tschofenig
Expires: March 25, 2011 Nokia Siemens Networks
September 21, 2010
Additional Data related to an Emergency Call
draft-ietf-ecrit-additional-data-00.txt
Abstract
When an emergency call is sent to a PSAP, the device that sends it,
as well as any service provider in the path of the call may have
information about the call which the PSAP may be able to use. This
document describes an XML data structure that contains this kind of
information in a standardized form. A URI that points to the
structure can be included in the SIP signaling with the call.
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
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time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on March 25, 2011.
Copyright Notice
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document authors. All rights reserved.
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include Simplified BSD License text as described in Section 4.e of
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Additional Data about a Call . . . . . . . . . . . . . . . . . 5
3.1. Data Provided by . . . . . . . . . . . . . . . . . . . . . 5
3.2. Provided by Company ID . . . . . . . . . . . . . . . . . . 6
3.3. Provided by Contact URI . . . . . . . . . . . . . . . . . 6
3.4. Provided by Languages(s) supported . . . . . . . . . . . . 7
3.5. vCARD of Provided By . . . . . . . . . . . . . . . . . . . 7
3.6. Service Environment . . . . . . . . . . . . . . . . . . . 8
3.7. Service Delivered by Provider to End User . . . . . . . . 8
3.8. Device Classification . . . . . . . . . . . . . . . . . . 10
3.9. Device Manufacturer . . . . . . . . . . . . . . . . . . . 11
3.10. Device Model Number . . . . . . . . . . . . . . . . . . . 12
3.11. Unique Device Identifier . . . . . . . . . . . . . . . . . 12
3.12. Type of Device Identifier . . . . . . . . . . . . . . . . 13
3.13. Device/service specific additional data structure . . . . 14
3.14. Telephone Number Privacy Indicator . . . . . . . . . . . . 15
3.15. vCARD for Subscriber's Data . . . . . . . . . . . . . . . 16
4. XML Schema . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5. Security Considerations . . . . . . . . . . . . . . . . . . . 19
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 20
6.1. 'emergencyCallData' Purpose Parameter Value . . . . . . . 20
6.2. URN Sub-Namespace Registration for
urn:ietf:params:xml:ns:additional-data . . . . . . . . . . 20
6.3. Additional Data Schema Registration . . . . . . . . . . . 21
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 22
8. Normative References . . . . . . . . . . . . . . . . . . . . . 23
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 24
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1. Introduction
When an emergency call is sent to a PSAP, there is a rich set of data
in the headers with the call, but the device, as well as any other
service provider in the path may have even more information that
would be useful to a PSAP. This information may include the identity
and contact information of the service provider, subscriber identity
and contact information, the type of service the service provider
provides, what kind of device the user has, etc. Some kinds of
devices or services have device or service dependent data. For
example, a car telematics system or service may have crash
information. A medical monitoring device may have sensor data.
While the details of the information may vary by device or service,
there needs to be a common way to send such data to a PSAP.
For the call takers this will enable more intelligent decision making
and therefore better response in case of an emergency. A pre-
requisite is to offer the technical capabilities to let call takers
to gain access to this information stored elsewhere (granted that
they have authorization to access it).
This document focuses on the data that can be obtained about a call
and an existing SIP header field, the Call-Info header, is used for
this purpose by defining a new token, namely 'emergencyCallData'
carried in the "purpose" parameter. If the "purpose" parameter set
to 'emergencyCallData' then the Call-Info contains a HTTPS URL that
points to an XML data structure with information about the call. The
initial XML data structure was defined by a working group within the
National Emergency Number Association (NENA) and is included in this
document.
The data structure contains an element which itself is a URI that has
device or service dependent data. Thus the common Additional Data
about a Call defined by this document contains a 'hook', in the form
of a URI for a device or service dependent data structure.
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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].
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3. Additional Data about a Call
The Additional Data about a Call is information specific to a call
known by the device that sends it or a service provider in the path
of a call. The Additional Data about a Call is an XML data
structure. An HTTPS URI to that structure may be inserted in a SIP
INVITE or MESSAGE transaction with a Call-Info header containing a
purpose of "emergenyCallData". The data, which must conform to the
schema in Section 4 may be retrieved with an HTTPS Get. HTTPS MUST be
used.
More than one Call-Info header with an emergencyCallData purpose can
be expected. The device may insert one, and any intermediary service
provider may insert its own. When there are multiple intermediaries
each intermediary may each insert one. For example, a device may
provide one, a telematics service provider may provide one and the
mobile carrier handling the call may provide one.
3.1. Data Provided by
Data Element: Data Provided by
Use: Required
XML Element: <DataProvidedBy>
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. This data is
required and should reflect the contact information of the owner
of the device.
Reason for Need: Inform the call taker about 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.
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3.2. Provided by Company ID
Data Element: Provided by Company ID
Use: Conditional
XML Element: <ProviderCompanyID>
Description: A jurisdiction specific code for the 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 may be found at
http://www.nena.org/nena-company-id. The NENA Company ID shall be
in the form of any URI for example: urn:nena:companyid:<NENA
Company ID>. This data is required unless the additional data
structure is provided by the device.
Reason for Need: Inform the call taker about the identity of the
entity providing the additional call data structure.
How Used by Call Taker: Where jurisdictions have lists of providers
the Provider Company ID can lead to a wealth of information
associated with the code.
3.3. Provided by Contact URI
Data Element: Provided by Contact URI
Use: Required
XML Element: <ContractURI>
Description: For a Service Provider the contact should be a 24x7
contact number. If provided by an entity without a 24X7, they
must provide the provided by contact information. This must be a
SIP URI. If a telephone number is the contact address it should
be provided in the form of
sip:telephonenumber@serviceprovider:user=phone. If the call is
from a device, this data is required and should reflect the
contact information of the owner of the device.
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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 provider structure.
3.4. Provided by Languages(s) supported
Data Element: Provided by Language(s) supported
Use: Conditional
XML Element: <LanguagePreference>
Description: Provided by's alpha 2-character code as defined in ISO
639-1:2002
(http://www.iso.org/iso/catalogue_detail?csnumber=22109) 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. This data is
required unless the message is from a data only device.
Reason for Need: Information needed to determine if 9-1-1 Authority
can communicate with the Service Provider or if language line will
be needed.
How Used by Call Taker: If call taker cannot speak language(s)
supported by the Service Provider, language line will need to be
added in to conversation.
3.5. vCARD of Provided By
Data Element: vCARD of Provided By
Use: Optional
XML Element: <ProvidedByContact>
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Description: There are many fields in the vCARD. The creator of the
data structure is encouraged to provide as much information as
they have available. A minimum of subscriber provided by's name,
address and contact number should be provided.
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. Can display a picture of the caller to the call
taker.
3.6. Service Environment
Data Element: Service Environment
Use: Required
XML Element: <SvcEnvironment>
Description: This defines if the call service type is a Business or
Residence caller. Currently, the only valid entries are Business
or Residence.
Reason for Need: To assist in determining equipment and manpower
requirements.
How Used by Call Taker: Information may be used to determine
equipment and manpower requirements for emergency responders.
3.7. Service Delivered by Provider to End User
Data Element: Service Delivered by Provider to End User
Use: Required
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XML Element: <SvcDelByProvider>
Description: This defines the type of service the end user has
subscribed to. The implied mobility of this service can not be
relied upon. A registry will reflect the following valid entries:
* Mobile Telephone Service: Includes Satellite, CDMA, GSM, Wi-Fi,
WiMAX, LTE (Long Term Evolution)
* Fixed Public Pay/Coin telephones: Any coin or credit card
operated device.
* One way outbound service
* Inmate call/service
* Soft dialtone/quick service/warm disconnect/suspended
* Multi-line telephone system (MLTS): Includes all PBX, Centrex,
key systems, Shared Tenant Service.
* Sensor, unattended: Includes devices that generate DATA ONLY.
This is one-way information exchange and there will be no other
form of communication.
* Sensor, attended: Includes devices that are supported by a
monitoring service provider or automatically open a two-way
communication path.
* Wireline: Plain Old Telephone Service (POTS).
* VoIP Telephone Service: A type of service that offers
communication over internet protocol, such as Fixed, Nomadic,
Mobile, Unknown
Reason for Need: Knowing the type of service may assist the PSAP
with the handling of the call.
How Used by Call Taker: Calltaker may be able to determine if the
caller is stationary or mobile and if they will have voice
communications with the caller or is it a data only event.
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3.8. Device Classification
Data Element: Device Classification
Use: Optional
XML Element: <DeviceClassification>
Description: 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 2
data structures, one created by the device and one created by the
Service Provider. Information about the device, not how it is
being used. This data element defines the kind of device making
the emergency call. A registry will reflect the following valid
entries:
* Cordless handset
* Fixed phone
* Mobile handset
* ATA - analog terminal adapter
* Satellite phone
* Stationary computing device (alarm system, data sensor)
* Guardian devices
* Desktop PC
* Laptop computing device
* Tablet computing device
* Alarm system
* Data sensor
* Personal beacons (spot)
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* Auto telematics (indicates VEDS data set)
* Trucking telematics
* Farm equipment telematics
* Marine telematics
* PDA (personal digital assistant)
* PND (personal navigation device)
* Smart phone
* Internet tablet
* Gaming console
* Video phone
* Other text device
* Not Available
Reason for Need: The device classification describes the capability
of the calling device. 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 rebid for 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 calltaker some context about the caller.
3.9. Device Manufacturer
Data Element: Device Manufacturer
Use: Optional
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XML Element: <DeviceMfgr>
Description: Manufacturer is electronically stored on the device.
Different devices may use different conventions to provide their
information. We need to know what it represents, so a registry is
in order. Need to be able to standardize as much as possible with
a uniform naming convention. A registry will reflect the valid
entries.
Reason for Need: Used by PSAP management for post-mortem
investigation/resolution.
How Used by Call Taker: Probably not used by calltaker, but by PSAP
management.
3.10. Device Model Number
Data Element: Device Model Number
Use: Optional
XML Element: <DeviceModelNr>
Description: Model number is electronically stored on the device.
Reason for Need: Used by PSAP management for after action
investigation/resolution.
How Used by Call Taker: Probably not used by calltaker, but by PSAP
management.
3.11. Unique Device Identifier
Data Element: Unique Device Identifier
Use: Optional
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XML Element: <UniqueDeviceID>
Description: Characters that identify the specific device making the
call or creating an event.
Reason for Need: May be needed when trying to obtain a subpoena to
obtain customer information in instances where location info did
not display or someone is making false emergency calls. May also
be used when working with safe houses that are using non-
initialized phones.
How Used by Call Taker: Probably not used by calltaker they would
need to refer to management for investigation.
3.12. Type of Device Identifier
Data Element: Type of Device Identifier
Use: Optional
XML Element: <TypeOfDeviceID>
Description: Identifies the type of device identifier being
generated in the unique device identifier data element. A
registry will reflect the following valid entries:
* MEID (CDMA)
* ESN (Electronic Serial Number - superseded by MEID)
* MAC (Media Access Control) Address - any IEEE device with an
Ethernet, Wi-Fi connection
* WiMAX has a device certificate
* IMEI (International Mobile Equipment Identifier - GSM)
* Unique Device Identifier (Unique identifier for medical
devices)
* RFID (Radio Frequency Identification)
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* Sensors (types to be identified in a future document version)
* Manufacturer Serial Number
Reason for Need: Calls from uninitiated devices would give an
identifier that could be associated with erroneous calls --- use
the number to identify what type of capabilities there are. Could
also use this information to block specific types of calls.
How Used by Call Taker: Additional information that may be used to
assist with call handling.
3.13. Device/service specific additional data structure
Data Element: Device/service specific additional data structure
Use: Optional
XML Element: <devicespecificSchema>
Description: A URI representing additional data whose schema is
specific to the device or service which created it. An example is
the VEDs structure for a vehicle telematics device. The structure
can be referenced via URI and used in the policy routing function
business rules/policies or for access by call takers or
responders. Non-NENA XML schemas must be registered. Some
possible sources are:
* NPAC
* Hazmat International Association of Fire Chiefs
* DHS/EPA E-Plan for HazMat
* NFPA - National Fire Protection Association
* National Alliance for Public Safety GIS (NA-PSG)
* US DOT Pipeline and Hazardous Materials Safety Administration
(PHMSA) examples of additional data.
* Fire Service Data Model
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* IEEE 1512 - USDOT Model for traffic incidents
* Smart Building (NIST)
* VEDS
Different data may be created by each classification; i.e.,
telematics creates VEDS data set - can be different types of data
depending on device. May want to describe type of data for each
device.
Reason for Need: This data element will allow for identification of
externally defined schemas, which may have additional data that
will assist in emergency response.
How Used by Call Taker: This data element will allow 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.
3.14. Telephone Number Privacy Indicator
Data Element: Telephone Number Privacy Indicator
Use: Required
XML Element: <TNPrivacyIndicator>
Description: Some State regulations require that Non-Published
subscriber name remains private to all including 9-1-1. Where
this regulation is in place, the end user's name must be overlaid
with blanks or the verbiage, "Non-Published Number."
Reason for Need: Some State regulations require that Non-Published
subscriber name remains private to all including emergency calls.
Where this regulation is in place, the end user's name must be
overlaid with blanks or the verbiage, "Non-Published Number".
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How Used by Call Taker: This is not beneficial to PSAPs; however,
they must follow state regulations. This indicator will allow for
coding that overlays the non-published subscriber name with the
verbiage "Non-Published Number."
3.15. vCARD for Subscriber's Data
Data Element: vCARD for Subscriber's Data
Use: Required
XML Element: <SubscriberData>
Description: Information known by the Service Provider about the
subscriber; i.e., Name, Address, Calling Party Number, Main
Telephone Number and any other data. If the subscriber is an
enterprise, this is the vCARD of the enterprise and the Company
Name is used not the Name of the Caller. The telephone number is
the main telephone number at the location of the call. The
address should be where the call is originating from.
Reason for Need: Critical information required for proper call
handling and dispatching.
How Used by Call Taker: Critical information required for proper
call handling and dispatching.
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4. XML Schema
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns="urn:nena:xml:ns:es:NG:Call"
targetNamespace="urn:nena:xml:ns:es:NG:Call"
elementFormDefault="qualified"
attributeFormDefault="unqualified" version="1.0">
<xsd:include schemaLocation="NGTypeLib.xsd"/>
<xsd:element name="DataAssociatedWithCall">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="DataProvidedBy"
type="sourceProviderType" minOccurs="0"/>
<xsd:element ref="CallerDataURL" minOccurs="0"/>
<xsd:element ref="ServiceEnvironment"/>
<xsd:element ref="ServiceDeliveredByProvider"/>
<xsd:element ref="DeviceClassification"/>
<xsd:element ref="DeviceManufacturer"/>
<xsd:element name="DeviceModel" type="xsd:token"/>
<xsd:element name="DeviceID" type="xsd:token"/>
<xsd:element ref="DeviceIDType"/>
<xsd:element name="DeviceSpecificSchema"
type="ExtensionType" minOccurs="0"/>
<xsd:element ref="PrivacyIndicator"/>
<xsd:element ref="SubscribervCARD"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:element name="CallerDataURL" type="xsd:anyURI">
</xsd:element>
<xsd:element name="ServiceDeliveredByProvider" type="xsd:token">
</xsd:element>
<xsd:element name="DeviceClassification" type="xsd:token">
</xsd:element>
<xsd:element name="DeviceManufacturer" type="xsd:token">
</xsd:element>
<xsd:element name="DeviceIDType" type="xsd:token">
</xsd:element>
<xsd:element name="PrivacyIndicator" type="privacyIndicatorType">
</xsd:element>
<xsd:simpleType name="privacyIndicatorType">
<xsd:restriction base="xsd:token">
<xsd:enumeration value="Published"/>
<xsd:enumeration value="Non-Published"/>
</xsd:restriction>
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</xsd:simpleType>
<xsd:element name="SubscribervCARD" type="vCARDType">
</xsd:element>
</xsd:schema>
Figure 1: XML Schema
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5. 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 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 Call-info header with purpose='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.
<how recipient validates credentials of sender>
<how sender validates credentials of recipient>
<how sender validates credentials of anyone requesting device
dependent data>
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6. IANA Considerations
6.1. 'emergencyCallData' Purpose Parameter Value
This document defines the 'emergencyCallData' value for the "purpose"
parameter of the Call-Info header field. A reference to this RFC (in
double brackets) has been added to the existing "purpose" Call-Info
parameter entry in the SIP Parameters registry, which currently looks
as follows:
Predefined
Header Field Parameter Name Values Reference
------------- -------------- --------- ---------
Call-Info purpose Yes [RFC3261][RFC5367]
6.2. URN Sub-Namespace Registration for
urn:ietf:params:xml:ns:additional-data
This section registers a new XML namespace, as per the guidelines in
[RFC3688].
URI: urn:ietf:params:xml:ns:additional-data
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>Additional Data Namespace</title>
</head>
<body>
<h1>Namespace for Additional Data </h1>
<h2>urn:ietf:params:xml:ns:additional-data</h2>
<p>See [TBD].</p>
</body>
</html>
END
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6.3. Additional Data Schema Registration
This specification registers a schema, as per the guidelines in
[RFC3688].
URI: urn:ietf:params:xml:schema:additional-data
Registrant Contact: IETF, ECRIT Working Group (geopriv@ietf.org),
as delegated by the IESG (iesg@ietf.org).
XML: The XML can be found as the sole content of Section 4.
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7. Acknowledgments
The authors would like to thank the following persons for their work
in the NENA Data Technical Committee: Delaine Arnold (Data Technical
Committee Chair), Marc Berryman, Erica Aubut (Data Technical
Committee Vice-Chair), Susan Sherwood, Ric Atkins, Patty Bluhm,
Eileen Boroski, David Connel, Maryls Davis, Paul-David de la Rosby,
Gordon Chinander, David Froneberger, Marilyn Haroutunian, Roger
Hixson, Rick Jones, Roger Marshall, Tom Muehleisen, Ira Pyles, Carl
Reed, Susan Seet, and Skip Walls. The authors would also like to
thank Tom Breen, Technical Committee Chair/Liaison; Busam, Technical
Committee Vice-Chair/Liaison; Pete Eggimann, Operations Committee
Chair/Liaison; Wendy Lively, Operations Committee Chair/Liaison;
Roger Hixson, Technical Director; and Rick Jones, Operations Issues
Director for their support and assistance.
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8. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
January 2004.
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Authors' Addresses
Brian Rosen
NeuStar
470 Conrad Dr.
Mars, PA 16046
US
Phone: +1 724 382 1051
Email: br@brianrosen.net
Hannes Tschofenig
Nokia Siemens Networks
Linnoitustie 6
Espoo 02600
Finland
Phone: +358 (50) 4871445
Email: Hannes.Tschofenig@gmx.net
URI: http://www.tschofenig.priv.at
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