IP Telephony Requirements for Emergency Telecommunication Service (ETS)
RFC 3690

Document Type RFC - Informational (February 2004; No errata)
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IESG IESG state RFC 3690 (Informational)
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Network Working Group                                        K. Carlberg
Request for Comments: 3690                                           UCL
Category: Informational                                      R. Atkinson
                                                        Extreme Networks
                                                           February 2004

                     IP Telephony Requirements for
               Emergency Telecommunication Service (ETS)

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2004).  All Rights Reserved.

Abstract

   This document presents a list of requirements in support of Emergency
   Telecommunications Service (ETS) within the context of IP telephony.
   It is an extension to the general requirements presented in RFC 3689.
   Solutions to these requirements are not presented in this document.

1.  Introduction

   Effective telecommunications capabilities can be imperative to
   facilitate immediate recovery operations for serious disaster events,
   such as, hurricanes, floods, earthquakes, and terrorist attacks.
   Disasters can happen unexpectedly, at any time or place.  Quick
   response for recovery operations requires immediate access to any
   public telecommunications capabilities at hand.  These capabilities
   include:  conventional telephone, cellular phones, and Internet
   access via online terminals, IP telephones, and wireless Personal
   Digital Assistants (PDAs).  The commercial telecommunications
   infrastructure is rapidly evolving to Internet-based technology.
   Therefore, the Internet community needs to consider how it can best
   support emergency management and recovery operations.

   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 [1].

Carlberg & Atkinson          Informational                      [Page 1]
RFC 3690               ETS Telephony Requirements          February 2004

1.1.  Problem

   Standards have been developed by other standards bodies concerning
   emergency communications.  As discussed in [3], some of these
   standards, such as T1.631 [5], define specific indicators or labels
   for emergency communications in Signaling System 7 (SS7) networks.
   Certain requirements must be defined in order to achieve peering
   across hybrid networks (networks that communicate between IP and
   other types of networks, such as that realized by the Public Switched
   Telephone Network) in order to achieve an interworking of services.

2.  Scope

   [3] has defined a set of general system requirements to support
   Emergency Telecommunications Service (ETS).  This document defines an
   additional set of system requirements to achieve support for ETS
   within the specific context of IP telephony (note that this document
   views IP telephony within the context of an end-to-end application
   layer service).  Solutions to requirements are not defined.  The
   document does not specify protocol enhancements or specifications.

   Note that [4], Requirements for Resource Priority Mechanisms for the
   Session Initiation Protocol (SIP), is an RFC that shares some overlap
   with this document.  However, [4] only applies to SIP and is not
   meant to be applied to a more general perspective of IP telephony as
   it relates to ETS.

2.1.  Out of Scope

   An item that is not in scope of this document is mandating acceptance
   and support of the requirements presented in this document.  The IETF
   does not mandate requirements or capabilities to independent networks
   that comprise the Internet.  As an example, Internet Service
   Providers (ISP) may choose not to operate any telephony-related
   gateways or services.  The IETF cannot and does not mandate that an
   ISP deploy either telephony-related gateways or telephony-related
   services.  There is an expectation that business contracts, for
   example Service Level Agreements (SLA), will be used to satisfy those
   following requirements that apply to service providers.  Absence of
   an SLA implies best effort service is provided.

   It is assumed that some ISPs will choose to offer ETS services and
   that other carriers will choose not to offer ETS services.  These
   requirements do not apply to ISPs that have chosen not to offer ETS
   services.

Carlberg & Atkinson          Informational                      [Page 2]
RFC 3690               ETS Telephony Requirements          February 2004

3.  IP Telephony Requirements

   The requirements in this section relate only to Telephony Signaling
   as used in Internet-based telephony services.  They are an extension
   to the general requirements specified in [3].  The following
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