ETSI TS 123 334 V14.6.0 (2020-01)
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS) Application Level Gateway (IMS-ALG) - IMS Access Gateway (IMS-AGW) interface: Procedures descriptions (3GPP TS 23.334 version 14.6.0 Release 14)
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS) Application Level Gateway (IMS-ALG) - IMS Access Gateway (IMS-AGW) interface: Procedures descriptions (3GPP TS 23.334 version 14.6.0 Release 14)
RTS/TSGC-0423334ve60
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ETSI TS 123 334 V14.6.0 (2020-01)
TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
IP Multimedia Subsystem (IMS)
Application Level Gateway (IMS-ALG)
- IMS Access Gateway (IMS-AGW) interface:
Procedures descriptions
(3GPP TS 23.334 version 14.6.0 Release 14)
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3GPP TS 23.334 version 14.6.0 Release 14 1 ETSI TS 123 334 V14.6.0 (2020-01)
Reference
RTS/TSGC-0423334ve60
Keywords
GSM,LTE,UMTS
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3GPP TS 23.334 version 14.6.0 Release 14 2 ETSI TS 123 334 V14.6.0 (2020-01)
Intellectual Property Rights
Essential patents
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pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
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Legal Notice
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
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Modal verbs terminology
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3GPP TS 23.334 version 14.6.0 Release 14 3 ETSI TS 123 334 V14.6.0 (2020-01)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 8
1 Scope . 9
2 References . 9
3 Definitions, symbols and abbreviations . 13
3.1 Definitions . 13
3.2 Symbols . 14
3.3 Abbreviations . 14
4 Architecture . 15
4.1 Reference architecture . 15
4.2 NAT Function . 16
4.3 ATCF/ATGW Function . 17
4.4 eP-CSCF/eIMS-AGW Function . 17
5 Functional Requirements . 18
5.1 General . 18
5.2 Gate Control & Local NAT . 18
5.3 IP realm indication and availability . 18
5.4 Remote NAT traversal support . 19
5.5 Remote Source Address/Port Filtering . 19
5.6 Traffic Policing . 19
5.7 Hanging Termination Detection . 19
5.8 QoS Packet Marking . 20
5.9 Handling of RTCP streams . 20
5.9.1 General . 20
5.9.2 RTP/RTCP transport multiplexing . 21
5.10 Media Inactivity Detection . 21
5.11 IMS Media Plane Security . 22
5.11.1 General . 22
5.11.2 End-to-access-edge Security . 22
5.11.2.1 End-to-access-edge security for RTP based media using SDES . 22
5.11.2.2 End-to-access-edge security for TCP based media using TLS . 23
5.11.2.2.1 General . 23
5.11.2.2.2 e2ae security for session based messaging (MSRP) . 24
5.11.2.2.3 e2ae security for conferencing (BFCP) . 25
5.11.2.3 End-to-access-edge security for UDP based media using DTLS . 25
5.11.2.3.1 General . 25
5.11.2.3.2 e2ae security for T.38 fax over UDP/UDPTL transport . 25
5.11.2.4 End-to-access-edge security for RTP based media using DTLS-SRTP . 26
5.11.2.5 End-to-access-edge security for RTP based voice and video media using DTLS-SRTP over TCP. 27
5.11.2.6 End-to-access-edge security for WebRTC data channels using UDP/DTLS/SCTP transport . 28
5.11.3 End-to-end Security . 28
5.11.3.1 End-to-end security for RTP based media . 28
5.11.3.2 End-to-end security for TCP-based media using TLS . 28
5.12 Explicit Congestion Notification support . 29
5.12.1 General . 29
5.12.2 Incoming SDP offer with ECN . 29
5.12.3 Incoming SDP offer without ECN . 29
5.12.4 Detection of ECN failures by IMS-AGW . 29
5.13 Transcoding . 30
5.13.1 General . 30
5.13.2 Handling of common codec parameters. 30
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3GPP TS 23.334 version 14.6.0 Release 14 4 ETSI TS 123 334 V14.6.0 (2020-01)
5.13.3 Handling of the EVS speech codec . 31
5.13.4 Handling of the OPUS speech and audio codec for WebRTC . 49
5.14 Multimedia Priority Service (MPS) Support . 52
5.15 Coordination of Video Orientation . 53
5.16 Generic image attributes . 54
5.17 TCP bearer connection control . 54
5.17.1 Stateless TCP handling . 54
5.17.2 State-aware TCP handling . 55
5.17.2.1 General . 55
5.17.2.2 State-aware TCP handling without support of modifying the TCP setup direction . 55
5.17.2.3 State-aware TCP handling with support of modifying the TCP setup direction . 56
5.18 Interactive Connectivity Establishment (ICE) . 58
5.18.1 General . 58
5.18.2 ICE lite . 58
5.18.3 Full ICE . 60
5.18.4 STUN consent freshness for WebRTC . 62
5.19 MSRP handling . 62
5.19.1 General . 62
5.19.2 IMS-ALG procedures to support IETF RFC 6714 with application agnostic MSRP handling by the
IMS-AGW . 63
5.19.3 IMS-ALG procedures to support IETF draft-ietf-simple-msrp-sessmatch with application agnostic
MSRP handling by the IMS-AGW . 63
5.19.4 IMS-ALG procedures for application aware MSRP interworking by the IMS-AGW . 64
5.19.5 Application-aware MSRP interworking at the IMS-AGW . 64
5.19.6 MSRP data channels . 64
5.20 Web Real-Time Communication (WebRTC) . 65
5.20.1 General . 65
5.20.2 WebRTC data channel . 66
5.20.2.1 General . 66
5.20.2.2 Data Channel Establishment . 66
5.20.2.3 Data Channel Release . 71
5.20.2.3.1 General . 71
5.20.2.3.2 Release of one WebRTC data channel . 72
5.20.2.3.3 Release of all or last active WebRTC data channels within an SCTP Association . 73
5.20.2.4 MSRP within WebRTC data channel . 74
5.20.2.5 Void. 74
5.20.2.6 T.140 within WebRTC data channel . 74
5.20.3 Media Plane Optimization . 74
5.20.3.1 General . 74
5.20.3.2 WIC originating call . 75
5.20.3.3 WIC terminating call . 76
5.21 Alternate Connection (ALTC) Addresses Management . 78
5.21.1 General . 78
5.22 Video Region-of-Interest (ROI) . 78
5.22.1 General . 78
5.22.2 "Far End Camera Control" mode . 78
5.22.3 "Predefined ROI" mode . 79
5.22.4 "Arbitrary ROI" mode. 80
5.23 SDP Capability Negotiation (SDPCapNeg) . 80
5.24 RTP-level pause and resume . 81
5.25 RTCP Codec Control Commands and Indications . 82
6 IMS-ALG to IMS-AGW Procedures . 83
6.1 Non-Call Related Procedures . 83
6.1.1 General . 83
6.1.2 IMS-AGW Unavailable . 83
6.1.3 IMS-AGW Available . 84
6.1.4 IMS-AGW Recovery . 85
6.1.5 IMS-ALG Recovery . 86
6.1.5.1 General . 86
6.1.5.2 IMS-ALG Restoration . 86
6.1.6 IMS-AGW Re-register . 86
ETSI
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3GPP TS 23.334 version 14.6.0 Release 14 5 ETSI TS 123 334 V14.6.0 (2020-01)
6.1.7 IMS-AGW Re-registration Ordered by IMS-ALG . 87
6.1.8 Audit of IMS-AGW . 87
6.1.8.1 Audit of Value . 87
6.1.8.2 Audit of Capability . 88
6.1.9 IMS-AGW Capability Change . 88
6.1.10 IMS-ALG Out of service . 88
6.1.11 IMS-AGW Resource Congestion Handling - Activate . 89
6.1.12 MGW Resource Congestion Handling -Indication . 89
6.1.13 Control association monitoring . 89
6.1.14 Realm Availability Monitoring . 90
6.1.15 Failure of IP Port, Interface or Group of Interfaces . 91
6.2 Call Related Procedures . 91
6.2.1 Gate Control & Local NA(P)T procedure . 91
6.2.2 IP realm indication procedure . 94
6.2.3 Remote NA(P)T traversal support procedure . 94
6.2.4 Remote Source Address/Port Filtering . 94
6.2.5 Traffic Policing . 95
6.2.6 Hanging Termination Detection . 95
6.2.7 QoS Packet Marking . 96
6.2.8 Media Inactivity Detection . 96
6.2.9 Handling of RTCP streams . 97
6.2.10 IMS end-to-access-edge Media Plane Security. 97
6.2.10.1 General . 97
6.2.10.2 End-to-access-edge security for RTP based media using SDES . 97
6.2.10.3 End-to-access-edge security for TCP-based media using TLS . 97
6.2.10.3.1 End-to-access-edge security for session based messaging (MSRP) . 97
6.2.10.3.1.1 IMS UE originating procedures for e2ae . 97
6.2.10.3.1.1.1 Incoming TCP bearer establishment triggers an outgoing TCP bearer establishment . 97
6.2.10.3.1.1.2 IMS-ALG requests sending an outgoing TCP bearer establishment . 100
6.2.10.3.1.2 IMS UE terminating procedures for e2ae . 102
6.2.10.3.1.2.1 Incoming TCP bearer establishment triggers an outgoing TCP bearer establishment . 102
6.2.10.3.1.2.2 IMS-ALG requests sending an outgoing TCP bearer establishment . 105
6.2.10.3.2 End-to-access-edge security for conferencing (BFCP) . 107
6.2.10.3.2.1 IMS UE originating procedures for e2ae . 107
6.2.10.3.2.1.1 Incoming TCP bearer establishment triggers an outgoing TCP bearer establishment . 107
6.2.10.3.2.2 IMS UE terminating procedures for e2ae . 110
6.2.10.3.2.2.1 Incoming TCP bearer establishment triggers an outgoing TCP bearer establishment . 110
6.2.10.4 End-to-access-edge security for UDP based media using DTLS . 113
6.2.10.4.1 General . 113
6.2.10.4.2 Session establishment from IMS access network for T.38 fax using "UDP/TLS/UDPTL" . 113
6.2.10.4.3 Session establishment towards IMS access network for T.38 fax using "UDP/TLS/UDPTL" . 116
6.2.10.4.4 IMS-AGW procedure for e2ae security of T.38 fax using "UDP/TLS/UDPTL" . 118
6.2.10.4.5 DTLS session establishment failure indication . 118
6.2.10.5 End-to-access-edge security for RTP based media using DTLS-SRTP . 119
6.2.10.6 End-to-access-edge security for WebRTC data channels using SCTP-over-DTLS transport . 123
6.2.10.6.1 General . 123
6.2.10.6.2 Call flow for data channel establishment from WIC towards IMS access network and MSRP
session establishment . 123
6.2.10A IMS end-to-end Media Plane Security . 126
6.2.10A.1 End-to-end security for RTP based media using SDES .
...
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