ETSI TS 124 173 V15.4.0 (2019-10)

TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
5G;
IMS Multimedia telephony communication service and
supplementary services;
Stage 3
(3GPP TS 24.173 version 15.4.0 Release 15)

3GPP TS 24.173 version 15.4.0 Release 15 1 ETSI TS 124 173 V15.4.0 (2019-10)

Reference
RTS/TSGC-0124173vf40
Keywords
5G,LTE,UMTS
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ETSI
3GPP TS 24.173 version 15.4.0 Release 15 2 ETSI TS 124 173 V15.4.0 (2019-10)
Intellectual Property Rights
Essential patents
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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
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Modal verbs terminology
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ETSI
3GPP TS 24.173 version 15.4.0 Release 15 3 ETSI TS 124 173 V15.4.0 (2019-10)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 6
1 Scope . 7
2 References . 7
3 Definitions, symbols and abbreviations . 9
3.1 Definitions . 9
3.2 Abbreviations . 9
4 Overview of multimedia telephony communication service and associated supplementary services
in the IP Multimedia (IM) Core Network (CN) subsystem . 10
4.1 General . 10
4.1A Roles . 10
4.1A.1 Multimedia telephony participant . 10
4.1A.2 Multimedia telephony application server . 10
4.2 Overview of basic communication part . 10
4.3 Overview of supplementary services part . 11
5 Basic Communication . 11
5.1 IMS communication service identifier . 11
5.2 Session control procedures . 11
5.3 Interworking . 12
5.4 Call progress indications . 12
6 Supplementary services and enhancements. 12
6.1 High level requirements . 12
6.2 Originating Identification Presentation (OIP) . 12
6.3 Originating Identification Restriction (OIR) . 12
6.4 Terminating Identification Presentation (TIP). 13
6.5 Terminating Identification Restriction (TIR) . 13
6.6 Communication Diversion (CDIV) . 13
6.7 Communication Hold (HOLD). 13
6.8 Communication Barring (CB) . 13
6.9 Message Waiting Indication (MWI) . 13
6.10 Conference (CONF) . 13
6.11 Explicit Communication Transfer (ECT) . 13
6.12 XCAP over Ut interface for Manipulating NGN Services . 13
6.13 Advice Of Charge (AOC) . 13
6.14 Closed User Groups (CUG). 13
6.15 Three-Party (3PTY) . 13
6.16 Flexible Alerting (FA) . 14
6.17 Communication Waiting (CW) . 14
6.18 Completion of Communications to Busy Subscriber (CCBS) Completion of Communications by No
Reply (CCNR) . 14
6.19 Customized Alerting Tones (CAT) . 14
6.20 Customized Ringing Signal (CRS) . 14
6.21 Personal Network Management (PNM) . 14
6.22 Unstructured Supplementary Service Data (USSD) . 14
6.23 Enhanced Calling Name (eCNAM) . 14
Annex A (informative): Void . 15
Annex B (informative): Void. . 15
Annex C (informative): Void . 15
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Annex D (informative): Void . 15
Annex E (informative): Void . 15
Annex F (informative): Void . 15
Annex G (informative): Void . 15
Annex H (informative): Void . 15
Annex I (informative): Void . 16
Annex J (normative): IP-Connectivity Access Network specific concepts when using EPS to
access IM CN subsystem . 17
J.1 Scope . 17
J.2 EPS aspects when connected to the IM CN subsystem . 17
J.2.1 Procedures at the UE . 17
J.2.1.1 Service Specific Access Control . 17
J.2.1.2 Smart Congestion Mitigation . 18
J.2.1.3 MMTEL request timeouts . 19
J.2.1.4 Abnormal cases . 19
J.3 Application usage of SIP . 20
J.3.1 Procedures at the UE . 20
J.3.1.1 3GPP PS data off . 20
J.3.1.1.1 General . 20
J.3.1.1.2 Enforcement . 20
J.3.2 Procedures at the multimedia telephony application server . 22
J.3.2.1 3GPP PS data off . 22
Annex K (normative): IP-Connectivity Access Network specific concepts when using GPRS
to access IM CN subsystem . 24
K.1 Scope . 24
K.2 GPRS (Iu mode only) aspects when connected to the IM CN subsystem . 24
K.2.1 Procedures at the UE . 24
K.2.1.1 General . 24
K.2.1.2 Application specific Congestion control for Data Communication (ACDC) procedure. 24
K.3 Application usage of SIP . 25
K.3.1 Procedures at the UE . 25
K.3.1.1 3GPP PS data off . 25
K.3.1.1.1 General . 25
K.3.1.1.2 Enforcement . 25
K.3.2 Procedures at the multimedia telephony application server . 26
K.3.2.1 3GPP PS data off . 26
Annex L (normative): Timers . 27
Annex M (normative): IP-Connectivity Access Network specific concepts when using 5GS to
access IM CN subsystem . 28
M.1 Scope . 28
M.2 5GS aspects when connected to the IM CN subsystem . 28
M.2.1 Procedures at the UE . 28
M.2.1.1 Unified Access Control . 28
M.2.1.2 MMTEL request timeouts . 29
M.2.1.2A Registration and authentication. 29
M.2.1.3 Abnormal cases . 29
M.3 Application usage of SIP . 30
M.3.1 Procedures at the UE . 30
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M.3.1.1 3GPP PS data off . 30
M.3.1.1.1 General . 30
M.3.1.1.2 Enforcement . 30
M.3.1.2 Establishing an MMTEL session . 31
M.3.2 Procedures at the multimedia telephony application server . 32
M.3.2.1 3GPP PS data off . 32
Annex N (informative): Change history . 33
History . 36

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3GPP TS 24.173 version 15.4.0 Release 15 6 ETSI TS 124 173 V15.4.0 (2019-10)
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
3GPP TS 24.173 version 15.4.0 Release 15 7 ETSI TS 124 173 V15.4.0 (2019-10)
1 Scope
The present document provides the protocol details for multimedia telephony communication service and associated
supplementary services in the IP Multimedia (IM) Core Network (CN) subsystem based on the requirements from
3GPP TS 22.173 [2].
Multimedia telephony and supplementary services allow users to establish communications between them and enrich
that by enabling supplementary services.
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 22.173: "IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service
and supplementary services; Stage 1".
[3] 3GPP TS 24.604: "Communication Diversion (CDIV); Protocol specification using IP Multimedia
(IM) Core Network (CN) subsystem; Protocol specification ".
[4] 3GPP TS 24.605: "Conference (CONF) using IP Multimedia (IM) Core Network (CN) subsystem;
Protocol specification".
[5] 3GPP TS 24.606: "Message Waiting Indication (MWI) using IP Multimedia (IM) Core Network
(CN) subsystem; Protocol specification".
[6] 3GPP TS 24.607: "Originating Identification Presentation (OIP) and Originating Identification
Restriction (OIR) using IP Multimedia (IM) Core Network (CN) subsystem; Protocol
specification".
[7] 3GPP TS 24.608: "Terminating Identification Presentation (TIP) and Terminating Identification
Restriction (TIR) using IP Multimedia (IM) Core Network (CN) subsystem; Protocol
specification".
[8] 3GPP TS 24.610: "Communication HOLD (HOLD) using IP Multimedia (IM) Core Network
(CN) subsystem; Protocol specification".
[9] 3GPP TS 24.611: "Anonymous Communication Rejection (ACR) and Communication Barring
(CB) using IP Multimedia (IM) Core Network (CN) subsystem; Protocol specification".
[10] 3GPP TS 24.629: "Explicit Communication Transfer (ECT) using IP Multimedia (IM) Core
Network (CN) subsystem; Protocol specification".
[11] 3GPP TS 24.623: "Extensible Markup Language (XML) Configuration Access Protocol (XCAP)
over the Ut interface for Manipulating Simulation Services".
[12] 3GPP TS 26.114: "IP Multimedia Subsystem (IMS); Multimedia telephony; Media handling and
interaction".
[13] 3GPP TS 24.229: "Internet Protocol (IP) multimedia call control protocol based on Session
Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
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[14] 3GPP TS 24.247: "Messaging using the IP Multimedia (IM) Core Network (CN) subsystem;
Stage 3".
[15] Void
[16] IETF RFC 3841 (August 2004): "Caller Preferences for the Session Initiation Protocol (SIP)".
[17] 3GPP TS 24.647: "Advice Of Charge (AOC) using IP Multimedia (IM)Core Network (CN)
subsystem; Protocol Specification".
[18] 3GPP TS 24.654: "Closed User Group (CUG) using IP Multimedia (IM) Core Network (CN)
subsystem, Protocol Specification".
[19] 3GPP TS 24.239: "IP Multimedia Subsystem (IMS) Flexible alerting supplementary service".
[20] 3GPP TS 24.238: "Session Initiation Protocol (SIP) based user configuration; stage 3".
[21] 3GPP2 C.S0055-A: "Packet Switched Video Telephony Services".
[22] ETSI TS 181 005: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); Service and Capability Requirements".
[23] 3GPP TS 24.615: "Communication Waiting (CW) using IP Multimedia (IM) Core Network (CN)
subsystem, Protocol Specification".
[24] 3GPP TS 24.642: "Completion of Communications to Busy Subscriber (CCBS) Completion of
Communications by No Reply (CCNR) using IP Multimedia (IM) Core Network (CN) subsystem;
Protocol specification".
[25] 3GPP TS 24.182: "IP Multimedia Subsystem (IMS) Customized Alerting Tones (CAT); Protocol
specification".
[26] 3GPP TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource
Control (RRC); Protocol specification".
[27] 3GPP TS 24.183: "IP Multimedia Subsystem (IMS) Customized Ringing Signal (CRS); Protocol
specification".
[28] IETF RFC 3362 (August 2002): "Real-time Facsimile (T.38) - image/t38 MIME Sub-type
Registration".
[29] 3GPP TS 24.259: "Personal Network Management (PNM); Stage 3".
[30] 3GPP TS 24.390: "Unstructured Supplementary Service Data (USSD) using IP Multimedia (IM)
Core Network (CN) subsystem IMS; Stage 3".
[31] IETF RFC 6809 (November 2012): "Mechanism to Indicate Support of Features and Capabilities
in the Session Initiation Protocol (SIP)".
[32] 3GPP TS 24.167: "3GPP IMS Management Object (MO); Stage 3".
[33] 3GPP TS 23.221: "Architectural requirements".
[34] Void.
[35] 3GPP TS 24.628: "Common Basic Communication procedures using IP Multimedia (IM) Core
Network (CN) subsystem; Protocol Specification".
[36] 3GPP TS 24.275: "Management Object (MO) for basic communication part of IMS multimedia
telephony (MMTEL) communication service".
[37] 3GPP TS 22.011: "Service accessibility".
[38] 3GPP TS 31.102: "Characteristics of the Universal Subscriber Identity Module (USIM)
application".
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[39] 3GPP TS 24.196: "Technical Specification Group Core Network and Terminals; Enhanced Calling
Name".
[40] 3GPP TS 24.008: "Mobile Radio Interface Layer 3 specification; Core Network Protocols;
Stage 3".
[41] 3GPP TS 23.122: "Non-Access-Stratum functions related to Mobile Station (MS) in idle mode".
[42] 3GPP TS 24.501: "Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in 3GPP TS 21.905 [1] apply.
MMTEL voice: a multimedia telephony communication session as described in subclause 5.2 with only audio or only
real-time text or only both audio and real-time text.
MMTEL video: a multimedia telephony communication session as described in subclause 5.2 with video.

For the purposes of the present document, the following terms and definitions given in 3GPP TS 22.011 [37] apply:
3GPP PS data off
3GPP PS data off exempt service

For the purposes of the present document, the following terms and definitions given in 3GPP TS 24.229 [13] apply:
3GPP PS data off status
For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.122 [41] apply:
Equivalent Home PLMN (EHPLMN)
Home PLMN (HPLMN)
Visited PLMN (VPLMN)
For the purposes of the present document, the following terms and definitions given in 3GPP TS 24.501 [42] apply:
NG-RAN
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
CS Circuit Switched
CN Core Network
ICSI IMS Communication Service Identifier
IP Internet Protocol
IM IP Multimedia
MMTEL Multimedia Telephony
NG-RAN Next Generation Radio Access Network
PS Packet Switched
UDP User Datagram Protocol
UDPTL UDP Transport Layer
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4 Overview of multimedia telephony communication
service and associated supplementary services in
the IP Multimedia (IM) Core Network (CN) subsystem
4.1 General
In accordance with the service definition and requirements in 3GPP TS 22.173 [2], the IMS multimedia telephony
communication service specified herein allows multimedia conversational communication between two or more end
points. An end point is typically located in a UE, but can also be located in a network entity.
As for traditional circuit-switched telephony, the protocols for the IMS multimedia Telephony communication service
allow a user to connect to any other user, regardless of operator and access technology.
The IMS multimedia Telephony communication service consists of two principal parts: a basic communication part,
and an optional supplementary services part.
4.1A Roles
4.1A.1 Multimedia telephony participant
A UE shall implement the role of a multimedia telephony participant.
4.1A.2 Multimedia telephony application server
An application server shall implement the role of a multimedia telephony application server. Various application server
usages are called out by references to the various supplementary services, see subclause 4.3. It is an implementation
decision on how to allocate the functionality to one or more application servers.
4.2 Overview of basic communication part
The basic communication part of an IMS multimedia telephony communication service session is realised by a single
SIP session. It utilises media capabilities and flexibility provided by the SIP protocol and the 3GPP IMS specifications.
In accordance with the service definition in 3GPP TS 22.173 [2], media capabilities include RTP-based transfer of
voice, real-time video, real-time text and data, and UDPTL-based transfer of fax (IETF RFC 3362 [28]), as well as
TCP/MSRP-based transfer of text, arbitrary files and sharing of media files with predefined formats.
To ensure interoperability, media handling (including codecs and formats) is fully specified for RTP-based and MSRP-
based transfer in:
- 3GPP TS 26.114 [12] for 3GPP systems;
- 3GPP2 C.S0055-A [21] for 3GPP2 systems; and
- ETSI TS 181 005 [22] (codecs) and 3GPP TS 26.114 [12] (formats and other media handling) for fixed-
broadband accesses.
The service is highly dynamic in terms of media component usage: the protocols allow a communication session to start
with one or more media components, and components can then be added and/or removed during the communication
session. The protocols allow both one-way and two ways transfer between end points. Full duplex speech, and speech
combined with other media components, are typical media cases but the protocols do not mandate the use of speech in
all sessions.
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4.3 Overview of supplementary services part
The supplementary services part of the IMS multimedia telephony communication service consists of a number of
specified supplementary services. These are fully standardized to ensure interoperability between multiple end points,
and between end points and network control entities. The behaviour of supplementary services is similar to
supplementary services specified for CS speech (TS 11). Supplementary services uses SIP as enabling protocol.
Configuration of supplementary services by the user should:
- take place over the Ut interface using XCAP as enabling protocol as described in 3GPP TS 24.623 [11]; or
- use SIP based user configuration as described in 3GPP TS 24.238 [20] ;
NOTE: Other possibilities for user configuration, such as web-based provisioning or pre-provisioning by the
operator are outside the scope of the present document, but are not precluded.
The "SS_domain_setting" leaf in 3GPP TS 24.167 [32] provides a mechanism to:
a) instruct the UE to only use the PS domain for SS setting control;
b) instruct the UE to only use the CS domain for SS setting control; or
c) instruct the UE to use the PS domain for SS setting control when the PS domain is being used by the UE for
voice services, and to use the CS domain for SS setting control when the CS domain is being used by the UE for
voice services.
If one of the restrictions described in the bullets a) or c) applies, then the "PS_domain_IMS_SS_control_preference"
leaf in 3GPP TS 24.167 [32] provides a mechanism to:
- restrict the UE to use the Ut interface with XCAP as enabling protocol as described in 3GPP TS 24.623 [11]; or
- restrict the UE to use SIP based user configuration as described in 3GPP TS 24.238 [20].
5 Basic Communication
5.1 IMS communication service identifier
URN used to define the ICSI for the IMS Multimedia Telephony Communication Service: urn:urn-7:3gpp-
service.ims.icsi.mmtel. The URN is registered at http://www.3gpp.com/Uniform-Resource-Name-URN-list.html.
Summary of the URN: This URN indicates that the device supports the IMS Multimedia Telephony Communication
Service.
The URN is intended primarily for use in the following applications, protocols, services, or negotiation mechanisms:
This URN is most useful in a communications application, for describing the capabilities of a device, such as a phone or
PDA.
Examples of typical use: Indicating that a mobile phone can support the IMS Multimedia Telephony Communication
Service.
Related standards or documents:
3GPP TS 24.173: "IMS Multimedia Telephony Communication Service and Supplementary Services, stage 3"
5.2 Session control procedures
The IMS multimedia telephony communication service can support different types of media, including media types
listed in 3GPP TS 22.173 [2]. The session control procedures for the different media types shall be in accordance with
3GPP TS 24.229 [13] and 3GPP TS 24.247 [14], with the following additions:
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a) Multimedia telephony is an IMS communication service and the P-Preferred-Service and P-Asserted-Service
headers shall be treated as described in 3GPP TS 24.229 [13]. The coding of the ICSI value in the P-Preferred-
Service and P-Asserted-Service headers shall be according to subclause 5.1.
b) The multimedia telephony participant shall include the "+g.3gpp. icsi-ref" header field parameter equal to the
ICSI value defined in subclause 5.1 in the Contact header field in initial requests and responses as described in
3GPP TS 24.229 [13].
c) The multimedia telephony participant shall include an Accept-Contact header field containing the "+g.3gpp.icsi-
ref" header field parameter containing the ICSI value defined in subclause 5.1 in initial requests. If the user
requests capabilities other than multimedia telephony, the Accept-Contact header field may contain other feature
parameters and feature parameter values, and other Accept-Contact header fields may be added to express user
preferences as per IETF RFC 3841 [16].
NOTE 1: How the user indicates other feature parameters and the feature parameter values is outside of the scope
of this document.
d) The multimedia telephony application server shall include the "+g.3gpp.icsi-ref" header field parameter equal to
the ICSI value defined in subclause 5.1 in a Feature-Caps header field in requests sent to the terminating user
and in 1xx or 2xx responses to requests from the originating user as described in 3GPP TS 24.229 [13] and
IETF RFC 6809 [31].
e) The multimedia telephony participant may use the presence of a "+g.3gpp.icsi-ref" header field parameter equal
to the ICSI value defined in subclause 5.1 in a Feature-Caps header field in requests and responses as described
in IETF RFC 6809 [31] to determine that a multimedia telephony application server is participating in the
session and multimedia telephony is the IMS communication service supported for use in the dialog.
NOTE 2: ICSI values with subclass identifiers are considered equal to the value defined in subclause 5.1 when
determining that the multimedia telephony application server is participating in the session.
f) The multimedia telephony application server may insert a Response-Source header field in accordance with the
procedures in subclause 5.7.1.0 of 3GPP TS 24.229 [13], where the "role" header field parameter is set to "tas"
when initiating a failure response to any received request.
5.3 Interworking
The multimedia telephony participant could receive initial requests that do not contain the ICSI value defined in
subclause 5.1 in the Accept-Contact header but still invoke the IMS multimedia telephony communication service
application.
5.4 Call progress indications
The UE shall support the UE procedures specified in 3GPP TS 24.628 [35].
6 Supplementary services and enhancements
6.1 High level requirements
6.2 Originating Identification Presentation (OIP)
The OIP service is specified in 3GPP TS 24.607 [6].
6.3 Originating Identification Restriction (OIR)
The OIR service is specified in 3GPP TS 24.607 [6].
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6.4 Terminating Identification Presentation (TIP)
The TIP service is specified in 3GPP TS 24.608 [7].
6.5 Terminating Identification Restriction (TIR)
The TIR service is specified in 3GPP TS 24.608 [7].
6.6 Communication Diversion (CDIV)
The CDIV service is specified in 3GPP TS 24.604 [3].
6.7 Communication Hold (HOLD)
The HOLD service is specified in 3GPP TS 24.610 [8].
6.8 Communication Barring (CB)
The CB service is specified in 3GPP TS 24.611 [9].
6.9 Message Waiting Indication (MWI)
The MWI service is specified in 3GPP TS 24.606 [5].
6.10 Conference (CONF)
The CONF service is specified in 3GPP TS 24.605 [4].
6.11 Explicit Communication Transfer (ECT)
The ECT service is specified in 3GPP TS 24.629 [10].
6.12 XCAP over Ut interface for Manipulating NGN Services
The XCAP is specified in 3GPP TS 24.623 [11].
6.13 Advice Of Charge (AOC)
The AOC service is specified in 3GPP TS 24.647 [17].
6.14 Closed User Groups (CUG)
The CUG service is specified in 3GPP TS 24.654 [18].
6.15 Three-Party (3PTY)
The 3PTY service is specified in 3GPP TS 24.605 [4].
NOTE: 3PTY can be seen as a special case of CONF and most of service interactions for CONF apply also to
3PTY.
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6.16 Flexible Alerting (FA)
The FA service is specified in 3GPP TS 24.239 [19].
NOTE: 3GPP TS 22.173 also contains a Reverse charging service, but no stage 3 work has been done for that in
this release.
6.17 Communication Waiting (CW)
The CW service is specified in 3GPP TS 24.615 [23].
6.18 Completion of Communications to Busy Subscriber (CCBS)
Completion of Communications by No Reply (CCNR)
The Completion of Communications to Busy Subscriber (CCBS) Completion of Communications by No Reply (CCNR)
service is specified in 3GPP TS 24.642 [24].
6.19 Customized Alerting Tones (CAT)
The CAT service is specified in 3GPP TS 24.182 [25].
6.20 Customized Ringing Signal (CRS)
The CRS service is specified in 3GPP TS 24.183 [27].
6.21 Personal Network Management (PNM)
The PNM service is specified in 3GPP TS 24.259 [29].
6.22 Unstructured Supplementary Service Data (USSD)
USSD using IMS is specified in 3GPP TS 24.390 [30].
NOTE: Usage of USSD using IMS is subject to policy specified in 3GPP TS 23.221 [33].
6.23 Enhanced Calling Name (eCNAM)
Enhanced CNAM (eCNAM) is specified in 3GPP TS 24.196 [39].
ETSI
3GPP TS 24.173 version 15.4.0 Release 15 15 ETSI TS 124 173 V15.4.0 (2019-10)
Annex A (informative):
Void
Annex B (informative):
Void.
Annex C (informative):
Void
Annex D (informative):
Void
Annex E (informative):
Void
Annex F (informative):
Void
Annex G (informative):
Void
Annex H (informative):
Void
ETSI
3GPP TS 24.173 version 15.4.0 Release 15 16 ETSI TS 124 173 V15.4.0 (2019-10)
Annex I (informative):
Void
ETSI
3GPP TS 24.173 version 15.4.0 Release 15 17 ETSI TS 124 173 V15.4.0 (2019-10)
Annex J (normative):
IP-Connectivity Access Network specific concepts when
using EPS to access IM CN subsystem
J.1 Scope
The present annex defines IP-CAN specific requirements for a multimedia telephony communication service and
associated supplementary services in the IP Multimedia (IM) Core Network (CN) subsystem, where the IP-CAN is
Evolved Packet System (EPS).
J.2 EPS aspects when connected to the IM CN
subsystem
J.2.1 Procedures at the UE
J.2.1.1 Service Specific Access Control
The following information is provided by lower layer:
- BarringFactorForMMTEL-Voice: barring rate for MMTEL voice;
- BarringTimeForMMTEL-Voice: barring timer for MMTEL voice;
- BarringFactorForMMTEL-Video: barring rate for MMTEL video; and
- BarringTimeForMMTEL-Video: barring timer for MMTEL video.
Upon request from a user to establish a multimedia telephony communication session as described in subclause 5.2, the
UE shall:
1) if the multimedia telephony communication session to be established is an emergency session, then skip the rest
of steps below and continue with session establishment as described in subclause 5.2;
2) retrieve SSAC related information mentioned above from lower layers;
NOTE 1: The values of SSAC related information retrieved from lower layers can depend on whether the UE has
an Access Class with a value in the range 11.15 or not. Determination of the values of the SSAC related
information is described in subclause 5.3.3.10 of 3GPP TS 36.331 [26].
3) if video is offered in the multimedia telephony communication session:
A) if back-off timer Tx is running, reject the multimedia telephony communication session establishment and
skip the rest of steps below; or
B) else, then:
I) draw a new random number "rand1" that is uniformly distributed in the range 0 ≤ rand1 < 1; and
II) if the random number "rand1" is lower than BarringFactorForMMTEL-Video, then skip the rest of steps
below and continue with session establishment as described in subclause 5.2;
NOTE 2: If the BarringFactorForMMTEL-Video is set to 1, the session is exempted from barring.
III) else, then;
i) draw a new random number "rand2" that is uniformly distributed in the range 0 ≤ rand2 < 1; and
ETSI
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