Input 3rd-Generation Partnership Project (3GPP) Release 5 Requirements on the Session Initiation Protocol (SIP)
RFC 4083

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Network Working Group                                   M. Garcia-Martin
Request for Comments: 4083                                         Nokia
Category: Informational                                         May 2005

            Input 3rd-Generation Partnership Project (3GPP)
    Release 5 Requirements on the Session Initiation Protocol (SIP)

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 (2005).

Abstract

   The 3rd-Generation Partnership Project (3GPP) has selected Session
   Initiation Protocol (SIP) as the session establishment protocol for
   the 3GPP IP Multimedia Core Network Subsystem (IMS).  IMS is part of
   Release 5 of the 3GPP specifications.  Although SIP is a protocol
   that fulfills most of the requirements for establishing a session in
   an IP network, SIP has never been evaluated against the specific 3GPP
   requirements for operation in a cellular network.  In this document,
   we express the requirements identified by 3GPP to support SIP for
   Release 5 of the 3GPP IMS in cellular networks.

Garcia-Martin                Informational                      [Page 1]
RFC 4083              3GPP R5 Requirements on SIP               May 2005

Table of Contents

   1. Introduction ....................................................4
   2. Conventions .....................................................4
   3. Overview of the 3GPP IMS ........................................5
   4. 3GPP Requirements on SIP ........................................7
      4.1. General Requirements .......................................7
           4.1.1. Efficient Use of the Radio Interface ................7
           4.1.2. Minimum Session Setup Time ..........................7
           4.1.3. Minimum Support Required in the Terminal ............8
           4.1.4. Roaming and Non-roaming .............................8
           4.1.5. Terminal Mobility Management ........................8
           4.1.6. IP Version 6 ........................................8
      4.2. SIP Outbound Proxy .........................................8
           4.2.1. SIP Outbound Proxy ..................................8
           4.2.2. Discovery of the SIP Outbound Proxy .................8
      4.3. Registration ...............................................9
           4.3.1. Registration Required ...............................9
           4.3.2. Efficient Registration .............................10
           4.3.3. Registration for Roaming and Non-roaming Cases .....10
           4.3.4. Visited Domain Name ................................10
           4.3.5. De-registration ....................................10
      4.4. SIP Compression ...........................................11
           4.4.1. Compression Algorithm Independence .................12
           4.4.2. Extensibility of the SIP Compression ...............12
           4.4.3. Minimal Impact of SIP Compression on the Network ...12
           4.4.4. Optionality of SIP Compression .....................12
      4.5. QoS Requirements Related to SIP ...........................13
           4.5.1. Independence between QoS Signaling and SIP .........13
           4.5.2. Coordination between SIP and QoS/Resource
                  Allocation .........................................13
      4.6. Prevention of Theft of Service ............................14
      4.7. Radio Resource Authorization ..............................14
      4.8. Prevention of Malicious Usage .............................14
      4.9. Prevention of Denial of Service ...........................14
      4.10. Identification of Users ..................................15
            4.10.1. Private User Identity ............................15
            4.10.2. Public User Identities ...........................15
            4.10.3. Delivery of the Dialed Public User ID ............17
      4.11. Identifiers Used for Routing .............................17
      4.12. Hiding Requirements ......................................17
            4.12.1. Hiding of the Network Structure ..................17
            4.12.2. Hiding of IP Addresses ...........................17
            4.12.3. SIP Hiding Proxy .................................18
      4.13. Cell-ID ..................................................18
            4.13.1. Cell-ID in Signaling from the UA to the
                    Visited and Home .................................18
            4.13.2. Format of the Cell-ID ............................18

Garcia-Martin                Informational                      [Page 2]
RFC 4083              3GPP R5 Requirements on SIP               May 2005

      4.14. Release of Sessions ......................................18
            4.14.1. Ungraceful Session Release .......................19