Content for TS 29.238 Word version: 17.0.0
1 Scope
2 References
3 Definitions, symbols and abbreviations
3.1 Definitions
3.2 Symbols
3.3 Abbreviations
4 Applicability
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...
1 Scope p. 5
The present document describes the protocol to be used on the Interconnection Border Control Function (IBCF) - Transition Gateway (TrGW) interface and the CS-IBCF - CS-TrGW interface. The basis for this protocol is the H.248 protocol as specified in ITU-T. The Profile provides MG control function for IMS and CS Border Control. The IMS architecture is described in TS 23.228. The underlying reference model and stage 2 information is described in Annex I of TS 23.228 and in TS 29.162. The CS architecture is described in Annex A of TS 29.235.
This specification describes the application of H.248 Ix profile for both Ix and CS-Ix interfaces (see Figure 1.1 and Figure 1.2). Required extensions use the H.248 standard extension mechanism. In addition certain aspects of the base protocol H.248 are not needed for this interface and thus excluded by this profile.
The reference model for the IBCF and the TrGW supporting the ATCF/ATGW function is shown in Figure 1.3 below.
See clause 5.2 of TS 23.237 for a comprehensive description of the reference model.
In the following text the terms IBCF and TrGW also include respectively the CS-IBCF and CS-TrGW functionalities.
2 References p. 7
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]
[47]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
[3]
ITU-T Recommendation H.248.1 (2002): "Gateway Control Protocol: Version 2" including the Corrigendum 1 for Version 2 (03/04).
[4]
ETSI TS 183 018 V3.5.1(2009-07): "Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Resource and Admission Control: H.248 Profile Version 3 for controlling Border Gateway Functions (BGF) in the Resource and Admission Control Subsystem (RACS); Protocol specification".
[5]
ITU-T Recommendation H.248.57 (06/2008): "Gateway control protocol: RTP Control Protocol Package".
[6]
ITU-T Recommendation H.248.43 (06/2008): "Gateway control protocol: Gate Management and Gate Control packages".
[7]
RFC 3605 (2003): "Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP)".
[8]
RFC 4566 (2006): "SDP: Session Description Protocol".
[9]
RFC 4975 (2007): "The Message Session Relay Protocol (MSRP)".
[10]
RFC 3551 (2003): "RTP Profile for Audio and Video Conferences with Minimal Control".
[11]
RFC 4145 (2005): "TCP-Based Media Transport in the Session Description Protocol (SDP)".
[12]
ITU-T Recommendation H.248.52 (06/2008): "Gateway control protocol: QoS support packages ".
[13]
ITU-T Recommendation H.248.53 (06/2008) inclusive Revision 1 (03/2009): "Gateway control protocol: Traffic management packages".
[14]
ITU-T Recommendation H.248.41 Amendment 1 (06/2008): "Gateway control protocol: IP domain connection package: IP Realm Availability Package".
[15]
ITU-T Recommendation H.248.36 (09/2005): "Gateway control protocol: Hanging Termination Detection package".
[16]
ITU-T Recommendation H.248.11 (11/2002): "Gateway control protocol: Media gateway overload control package".
Inclusive Corrigendum 1 (06/2008) to H.248.11 "Gateway control protocol: Media gateway overload control package: Clarifying MG-overload event relationship to ADD commands".
[17]
Inclusive Corrigendum 1 (06/2008) to H.248.11 "Gateway control protocol: Media gateway overload control package: Clarifying MG-overload event relationship to ADD commands".
TS 29.235: "Interworking between SIP-I based circuit-switched core network and other networks".
[18]
TS 29.162: "Interworking between the IM CN subsystem and IP networks".
[19]
ITU-T Recommendation H.248.14 (03/2009): "Gateway control protocol: Inactivity timer package".
[20]
ITU-T Recommendation H.248.10 (07/2001): "Media gateway resource congestion handling package".
[21]
TS 29.232: "Media Gateway Controller (MGC) - Media Gateway (MGW) interface; Stage 3".
[22]
TS 33.210: "Technical Specification Group Services and System Aspects; 3G Security; Network Domain Security; IP Network Layer Security".
[23]
ITU-T Recommendation V.152 (01/2005): "Procedures for supporting voice-band data over IP networks".
[24]
ITU-T Supplement 7 to ITU-T H-series Recommendations H.Sup7 (05/2008): "Gateway control protocol: Establishment procedures for the H.248 MGC-MG control association".
[25]
RFC 5234 (2008): "Augmented BNF for Syntax Specifications: ABNF ".
[26]
RFC 4960 (2007): "Stream control transmission protocol".
[27]
ITU-T Recommendation H.248.40 (01/2007): "Gateway control protocol: Application Data Inactivity Detection package".
[28]
ITU-T Recommendation X.690 (11/2008): "ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER)".
[29]
RFC 3556 (2003): "Session Description Protocol (SDP) Bandwidth Modifiers for RTP Control Protocol (RTCP) Bandwidth".
[30]
RFC 4585 (2006): "Extended RTP Profile for Real-time Transport Control Protocol (RTCP) - Based Feedback (RTP/AVPF)".
[31]
TS 26.114: "IP Multimedia Subsystem (IMS); Multimedia telephony; Media handling and interaction".
[32]
RFC 2216 (1997): "Network Element Service Specification Template".
[33]
RFC 3711 (2004): "The Secure Real-time Transport Protocol (SRTP)".
[34]
RFC 5124 (2008): "Extended Secure RTP Profile for Real-time Transport Control Protocol (RTCP)-Based Feedback (RTP/SAVPF)".
[35]
RFC 6679 (2012): "Explicit Congestion Notification (ECN) for RTP over UDP".
[36]
RFC 3611 (2003): "RTP Control Protocol Extended Reports (RTCP XR)".
[37]
RFC 3168 (2001): "The Addition of Explicit Congestion Notification (ECN) to IP".
[38]
TS 23.237: "IP Multimedia subsystem (IMS) Service Continuity; Stage 2".
[39]
TS 22.153: "Multimedia Priority Service".
[40]
ITU-T Recommendation H.248.82 (03/2013): "Gateway control protocol: Explicit Congestion Notification Support".
[41]
RFC 5285: "A General Mechanism for RTP Header Extensions".
[42]
RFC 6236: "Negotiation of Generic Image Attributes in the Session Description Protocol (SDP)".
[43] Void.
[44]
ITU-T Recommendation H.248.50 (09/2010) Corrigendum 1 (02/12): "Gateway control protocol: NAT traversal toolkit packages".
[45]
TS 24.229: "IP Multimedia Call Control Protocol based on SIP and SDP".
[46]
Draft ITU-T Recommendation H.248.78 (Ed. 0.9, 11/2014): "Gateway control protocol: Bearer-level message backhauling and application level gateway".
RFC 4573: "MIME Type Registration for RTP Payload Format for H.224".
[48]
ITU-T Recommendation H.224 (01/2005): "A real time control protocol for simplex applications using the H.221 LSD/HSD/MLP channels".
[49]
ITU-T Recommendation H.281 (11/1994): "A far end camera control protocol for videoconferences using H.224".
[50]
RFC 5939: "Session Description Protocol (SDP) Capability Negotiation".
[51]
ITU-T Recommendation H.248.80 (01/2014): "Gateway control protocol: Usage of the revised SDP offer/answer model with ITU-T H.248".
[52]
ITU-T Recommendation H.248.88 (01/2014): "Gateway control protocol: RTP topology dependent RTCP handling by ITU-T H.248 media gateways with IP terminations".
[53]
RFC 5104: "Codec Control Messages in the RTP Audio-Visual Profile with Feedback (AVPF)".
[54]
RFC 7728: "RTP Stream Pause and Resume".
[55]
RFC 8445: "Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal".
[56]
RFC 8839: "Session Description Protocol (SDP) Offer/Answer Procedures for Interactive Connectivity Establishment (ICE)".
3 Definitions, symbols and abbreviations p. 10
3.1 Definitions p. 10
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.
Address:
term used for "network address" (IP address)
CS-TrGW:
packet-to-packet gateway for user plane media traffic. The CS-TrGW performs both policy enforcement functions and NA(P)T functions under the control of the CS-IBCF
Port:
term used for "transport port" (L4 port).
TRANSCODING:
transcoding in general is the translation from one type of encoded media format to another different media format, e.g. G.711 A-law to μ-law or vice versa, G.729 to AMR with 4.75 rate.
Transparent Forwarding:
media gateway packet forwarding behaviour with the characteristic of Lx-PDU integrity. This is a unidirectional characteristic of an Lx-PDU flow.
Transport Address:
term used for the combination of a Network Address and a Transport Port.
TrGW:
packet-to-packet gateway for user plane media traffic. The TrGW performs both policy enforcement functions and NA(P)T functions under the control of the IBCF
For the purposes of the present document, the following terms and definitions as defined in TS 29.162 apply:
ICE lite
Full ICE
3.2 Symbols p. 10
For the purposes of the present document, the following symbols apply:
Ix
Interface between IBCF and TrGW or CS-IBCF and CS-TrGW.
3.3 Abbreviations p. 10
For the purposes of the present document the abbreviations defined in TR 21.905 apply, with the following additions. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
ABNF
Augmented Backus-Naur Form
ATCF
Access Transfer Control Function
ATGW
Access Transfer Gateway
B-ALG
Bearer Level Application-Level Gateway
BGF
Border Gateway Function
CCM
Codec Control Messages
CE
Congestion Experienced
CVO
Coordination of Video Orientation
DBI
Delay Budget Information
ECN
Explicit Congestion Notification
FECC
Far End Camera Control
FIR
Full Intra Request
GCP
Gateway Control Protocol
IBCF
Interconnect Border Control Function
ICE
Interactive Connectivity Establishment
LD
Local Descriptor (H.248 protocol element)
MG
Media Gateway
MGC
Media Gateway Controller
MPS
Multimedia Priority Service
MSRP
Message Session Relay Protocol
NA
Not Applicable
NAPT
Network Address and Port Translation
NAPT-PT
NAPT and Protocol Translation
NAT
Network Address Translation
PCI
Protocol Control Information
RD
Remote Descriptor (H.248 protocol element)
ROI
Region of Interest
RTCP
RTP Control Protocol
SDP
Session Description Protocol
SDPCapNeg
SDP Capability Negotiation
SRVCC
Single Radio Voice Call Continuity
STUN
Session Traversal Utilities for NAT
TCP
Transmission Control Protocol
TMMBN
Temporary Maximum Media Stream Bit Rate Notification
TMMBR
Temporary Maximum Media Stream Bit Rate Request
ToS
Type-of-Service
TrGW
Transition Gateway
TISPAN
Telecommunications and Internet converged Services and Protocols for Advanced Networking
WebRTC
Web Real-Time Communication
4 Applicability p. 11
The support of the IMS and CS Ix interfaces capability sets shall be identified by the H.248 Ix profile and support of this profile shall be indicated in H.248 ServiceChange procedure (during the (re-)registration phase(s)).
