ETSI TS 129 334 V14.4.0 (2020-01)

Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; IMS Application Level Gateway (IMS-ALG) - IMS Access Gateway (IMS-AGW); Iq Interface; Stage 3 (3GPP TS 29.334 version 14.4.0 Release 14)

RTS/TSGC-0429334ve40

General Information

• Status: Published
• Publication Date: 14-Jan-2020
• Technical Committee: 3GPP CT 4 - MAP/CAMEL/GTP/BCH/SS/TrFO/IMS/GUP/WLAN (formely CN4)
• Current Stage: 12 - Completion
• Completion Date: 15-Jan-2020

Standards Content (Sample)

ETSI TS 129 334 V14.4.0 (2020-01)






TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
IMS Application Level Gateway (IMS-ALG)
- IMS Access Gateway (IMS-AGW);
Iq Interface;
Stage 3
(3GPP TS 29.334 version 14.4.0 Release 14)

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3GPP TS 29.334 version 14.4.0 Release 14 1 ETSI TS 129 334 V14.4.0 (2020-01)



Reference
RTS/TSGC-0429334ve40
Keywords
GSM,LTE,UMTS
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3GPP TS 29.334 version 14.4.0 Release 14 2 ETSI TS 129 334 V14.4.0 (2020-01)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
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ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
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Legal Notice
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities. These shall be
interpreted as being references to the corresponding ETSI deliverables.
The cross reference between 3GPP and ETSI identities can be found under http://webapp.etsi.org/key/queryform.asp.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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3GPP TS 29.334 version 14.4.0 Release 14 3 ETSI TS 129 334 V14.4.0 (2020-01)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 6
1 Scope . 7
2 References . 8
3 Definitions, symbols and abbreviations . 12
3.1 Definitions . 12
3.2 Symbols . 12
3.3 Abbreviations . 12
4 Applicability . 13
4.1 Architecture . 13
5 Profile Description . 14
5.1 Profile Identification. 14
5.2 Summary . 14
5.3 Gateway Control Protocol Version . 15
5.4 Connection model. 15
5.5 Context attributes . 15
5.6 Terminations . 15
5.6.1 Termination names . 15
5.6.1.1 IP Termination . 15
5.6.1.1.1 ABNF Coding Overview and prose specification . 15
5.6.1.1.2 ASN.1 Coding Overview and prose specification . 16
5.6.2 Multiplexed terminations . 17
5.7 Descriptors . 17
5.7.1 TerminationState Descriptor . 17
5.7.2 Stream Descriptor . 18
5.7.2.0 General . 18
5.7.2.1 LocalControl Descriptor . 18
5.7.3 Events descriptor . 19
5.7.4 EventBuffer descriptor . 21
5.7.5 Signals descriptor . 21
5.7.6 DigitMap descriptor . 23
5.7.7 Statistics descriptor . 23
5.7.8 ObservedEvents descriptor . 23
5.7.9 Topology descriptor . 23
5.7.10 Error descriptor . 24
5.8 Command API . 27
5.8.1 Add . 27
5.8.2 Modify . 27
5.8.3 Subtract . 28
5.8.4 Move . 28
5.8.5 AuditValue . 28
5.8.6 AuditCapabilities . 28
5.8.7 Notify . 29
5.8.8 ServiceChange . 29
5.8.9 Manipulating and auditing context attribute s . 31
5.9 Generic command syntax and encoding . 31
5.10 Transactions . 31
5.11 Messages . 32
5.12 Transport . 32
5.13 Security . 33
5.14 Packages . 33
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3GPP TS 29.334 version 14.4.0 Release 14 4 ETSI TS 129 334 V14.4.0 (2020-01)
5.14.1 Mandatory Packages . 33
5.14.2 Optional Packages . 35
5.14.3 Package usage information . 37
5.14.3.1 Generic (g) . 37
5.14.3.2 Base root (root) . 38
5.14.3.3 Differentiated Services (ds) . 39
5.14.3.4 Gate Management (gm) . 39
5.14.3.5 Traffic management (tman) . 41
5.14.3.6 Inactivity Timer (it) . 42
5.14.3.7 IP Domain Connection (ipdc) . 42
5.14.3.8 Media Gateway Overload Control Package (ocp) . 43
5.14.3.9 Hanging Termination Detection (hangterm) . 43
5.14.3.10 Media Gateway Resource Congestion handling Package (chp) . 44
5.14.3.11 IP Realm Availability (ipra) . 44
5.14.3.12 IP NAPT Traversal (ipnapt) . 45
5.14.3.13 RTCP Handling Package (rtcph) . 45
5.14.3.14 Application Data Inactivity Detection (adid) . 46
5.14.3.15 Explicit Congestion Notification for RTP-over-UDP Support (ecnrous) . 47
5.14.3.16 MG Act-as STUN Server (mgastuns) . 49
5.14.3.17 Originate STUN Continuity Check (ostuncc) . 50
5.14.3.18 TCP basic connection control (tcpbcc) . 51
5.14.3.19 TLS basic session control (tlsbsc) . 52
5.14.3.20 Stream endpoint interlinkage (seplink) . 53
5.14.3.21 MG located Bearer Level ALG (mgbalg) . 54
5.14.3.22 STUN Consent Freshness (stnconfres). 54
5.14.3.23 Media Grouping (mgroup) . 56
5.14.3.24 SCTP basic connection control package (sctpbcc) . 57
5.14.3.25 SCTP Re-configuration Stream Reset (sctpreset) . 58
5.15 Mandatory support of SDP and Annex C information elements . 60
5.16 Optional support of SDP and Annex C information elements . 63
5.17 Procedures . 68
5.17.1 Formats and Codes . 68
5.17.2 Call Related Procedures . 75
5.17.2.1 General . 75
5.17.2.2 Reserve AGW Connection Point . 76
5.17.2.3 Configure AGW Connection Point . 82
5.17.2.4 Reserve and Configure AGW Connection Point . 91
5.17.2.5 Release AGW Termination . 100
5.17.2.6 Termination Heartbeat Indication . 100
5.17.2.7 IP Bearer Released . 101
5.17.2.8 Media Inactivity Notification . 101
5.17.2.9 Change Through Connection . 102
5.17.2.10 Change Flow Direction . 102
5.17.2.11 ECN Failure Indication . 103
5.17.2.12 ICE Connectivity Check Result Notification . 103
5.17.2.13 ICE New Peer Reflexive Candidate Notification . 103
5.17.2.14 Notify TCP connection establishment Failure Indication . 104
5.17.2.15 Notify (D)TLS session establishment Failure Indication . 104
5.17.2.16 STUN Consent Freshness Test Failure Notification . 105
5.17.2.17 Notify SCTP Stream Reset . 105
5.17.2.18 Notify SCTP Stream Reset Result . 106
5.17.3 Non-Call Related Procedures . 106
5.17.3.1 General . 106
5.17.3.2 IMS-AGW Out Of Service . 107
5.17.3.3 IMS-AGW Communication Up . 108
5.17.3.4 IMS-AGW Restoration . 108
5.17.3.5 IMS-AGW Register . 109
5.17.3.6 IMS-AGW Re-Register . 109
5.17.3.7 IMS-ALG Ordered Re-register . 110
5.17.3.8 IMS-ALG Restoration . 110
5.17.3.9 IMS-ALG Out of Service . 111
5.17.3.10 Audit Value . 111
ETSI

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3GPP TS 29.334 version 14.4.0 Release 14 5 ETSI TS 129 334 V14.4.0 (2020-01)
5.17.3.11 Command Rejected . 113
5.17.3.12 AGW Capability Change . 113
5.17.3.13 IMS-AGW Resource Congestion Handling – Activate . 113
5.17.3.14 IMS-AGW Resource Congestion Handling – Indication . 114
5.17.3.15 Inactivity Timeout – Activation . 114
5.17.3.16 Inactivity Timeout – Indication . 115
5.17.3.17 Realm Availability Change – Activation . 115
5.17.3.18 Realm Availability Change – Indication . 115
5.17.3.19 Termination Out Of Service . 116
Annex A (informative): Change history . 117
History . 120


ETSI

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3GPP TS 29.334 version 14.4.0 Release 14 6 ETSI TS 129 334 V14.4.0 (2020-01)
Foreword
rd
This Technical Specification has been produced by the 3 Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.

ETSI

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3GPP TS 29.334 version 14.4.0 Release 14 7 ETSI TS 129 334 V14.4.0 (2020-01)
1 Scope
The present document describes the protocol to be used on the IMS Application Level Gateway (ALG) – IMS Access
Gateway (IMS-AGW) interface. The basis for this protocol is the H.248 protocol as specified in ITU-T. The IMS
architecture is described in 3GPP TS 23.228 [2]. The underlying reference model and stage 2 information is described
in Annex G of 3GPP TS 23.228 [2] and in 3GPP TS 23.334 [23].
This specification describes the application of H.248 on the Iq interface (see Figure 1). 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.
P-CSCF
Gm
IMS-ALG
Scope of this
Iq
specification.
IP-CAN
NAT
UE
IMS Access Gateway
Media

Figure 1: Reference model for IMS access
The reference model for the IMS-ALG and the IMS-AGW supporting the ATCF/ATGW function is shown in Figure 1a
below.

Gm
P-CSCF
IMS
Mw/Mx
I/S-CSCF
Mw/I2
IMS-ALG
SCC AS
MSC
(ATCF)
Server
CS
Mc
access
CS-
Iq
MGW
UE
PS-to-CS Access
Transfer
NAT
PS Mb
access
Mb
IMS-AGW (ATGW)
Mb

Figure 1a: Reference model for IMS-ALG/IMS-AGW with ATCF/ATGW function
See 3GPP TS 23.237 [38] clause 5.2 for a comprehensive description of the reference model.
The reference model for the P-CSCF enhanced for WebRTC (eP-CSCF) and the IMS-AGW enhanced for WebRTC
(eIMS-AGW) to support WebRTC client access to IMS is shown in Figure 1b as below, see 3GPP TS 23.228 [2]
Annex U for a comprehensive description of the reference model.
ETSI

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3GPP TS 29.334 version 14.4.0 Release 14 8 ETSI TS 129 334 V14.4.0 (2020-01)
W4

WWSF WAF
W1
W5
WIC
W2 Mw
eP-CSCF
I/S-CSCF
IMS-ALG
I
Rx
P P
N
- C
A
Iq
C E
H/V-PCRF
T
A F
N Gx
UE
eIMS-AGW
W3

Figure 1b: Reference Architecture for eP-CSCF/eIMS-AGW supporting WebRTC access to IMS
NOTE: The presence of dashed elements in the figure depends on the configuration.
PCC functional elements are present only for EPC access with QoS.
The corresponding PCC elements for fixed access are also optionally supported but not shown.
The NAT in figure 1b is meant for non-cellular access to IMS.
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] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
[3] 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".
[4] ITU-T Recommendation H.248.37 (06/2008): "Gateway control protocol: IP NAPT traversal
package".
[5] ITU-T Recommendation H.248.57 (10/2014): "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] ITU-T Recommendation H.248.53 (03/2009): "Gateway control protocol: Traffic management
packages".
[8] ITU-T Recommendation H.248.41 Amendment 1 (06/2008): "Gateway contr
...