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Content for  TS 24.322  Word version:  16.0.0

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1  ScopeWord‑p. 6
The present document specifies procedures and protocol elements for tunnelling of IMS traffic over restrictive access networks, specifically procedures and protocol elements for establishing, maintaining, and sending traffic via a firewall traversal tunnel between the UE and an enhanced firewall traversal function (EFTF) in the network. The present document is applicable to UE and EFTF.
The present document applies only to the case when the IMS traffic is not routed via EPC of a PLMN. Procedures for tunnelling of IMS traffic that is routed via EPC are specified in TS 24.302 Annex F.
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2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 24.229: "IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
[3]
TS 24.302: "Access to the 3GPP Evolved Packet Core (EPC) via non-3GPP access networks; Stage 3".
[4]
TS 33.203: "3G security; Access security for IP-based services".
[5]
RFC 791  (September 1981): "Internet Protocol".
[6]
RFC 2131  (March 1997): "Dynamic Host Configuration Protocol".
[7]
RFC 2460  (December 1998): "Internet Protocol, Version 6 (IPv6) Specification".
[8]
RFC 2817  (May 2000): "Upgrading to TLS Within HTTP/1.1".
[9]
RFC 3736  (April 2004): "Stateless Dynamic Host Configuration Protocol (DHCP) Service for IPv6".
[10]
RFC 4291  (February 2006): "IP Version 6 Addressing Architecture".
[11]
RFC 4862  (September 2007): "IPv6 Stateless Address Autoconfiguration".
[12]  Void.
[13]  Void.
[14]
TS 33.310: "Network Domain Security (NDS); Authentication Framework (AF)".
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3  Definitions and abbreviationsWord‑p. 7

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply.
A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
Firewall traversal tunnel to IP network of IMS:
a TCP connection with TLS connection enabling passing of envelopes between UE in restrictive non-3GPP access network and EFTF, established in order to reach IP network of IP multimedia core network subsystem.
For the purposes of the present document, the following terms and definitions given in TS 24.229 apply:
IP multimedia core network subsystem
For the purposes of the present document, the following terms and definitions given in TS 24.302 apply:
Restrictive non-3GPP access network type I
Restrictive non-3GPP access network type II
Restrictive non-3GPP access network
For the purposes of the present document, the following terms and definitions given in TS 33.203 apply:
Enhanced firewall traversal function
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3.2  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
EFTF
Enhanced firewall traversal function
FTT-IMS
Firewall traversal tunnel to IP network of IMS
HTTP
Hypertext transfer protocol
IMS
IP multimedia core network subsystem
TCP
Transmission control protocol
TLS
Transport layer security
URI
Uniform resource identifier
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4  UE - network protocols

4.1  General

In order to access to IMS via restrictive non-3GPP access network, the UE and the EFTF shall establish a firewall traversal tunnel to IP network of IMS (FTT-IMS) using the UE requested FTT-IMS establishment procedure according to subclause 5.2.
The UE and the EFTF shall send the IP packets using the IP packet transport FTT-IMS procedure according to subclause 5.3.
The UE and the EFTF shall use the IP protocol according to clause 6.
When FTT-IMS is no longer needed (e.g. if the UE deregistered from IMS), the UE shall perform the UE requested FTT-IMS release procedure according to subclause 5.4.
When FTT-IMS is no longer needed, the EFTF can perform the EFTF requested FTT-IMS release procedure according to subclause 5.5.
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