ETSI TS 137 579-4 V17.5.0 (2026-04)

LTE; 5G; Mission Critical (MC) services; Part 4: Test Applicability and Implementation Conformance Statement (ICS) proforma specification (3GPP TS 37.579-4 version 17.5.0 Release 17)

RTS/TSGR-0537579-4vh50

General Information

• Status: Not Published
• Technical Committee: 3GPP RAN 5 - Mobile Terminal Conformance Testing (formely T1)
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Completion Date: 02-Apr-2026

Standards Content (Sample)

TECHNICAL SPECIFICATION
LTE;
5G;
Mission Critical (MC) services;
Part 4: Test Applicability and Implementation Conformance
Statement (ICS) proforma specification
(3GPP TS 37.579-4 version 17.5.0 Release 17)

3GPP TS 37.579-4 version 17.5.0 Release 17 1 ETSI TS 137 579-4 V17.5.0 (2026-04)

Reference
RTS/TSGR-0537579-4vh50
Keywords
5G,LTE
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ETSI
3GPP TS 37.579-4 version 17.5.0 Release 17 2 ETSI TS 137 579-4 V17.5.0 (2026-04)
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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
3GPP TS 37.579-4 version 17.5.0 Release 17 3 ETSI TS 137 579-4 V17.5.0 (2026-04)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 4
1 Scope . 6
2 References . 6
3 Definitions of terms, symbols and abbreviations . 7
3.1 Terms . 7
3.2 Symbols . 8
3.3 Abbreviations . 8
4 Recommended Test Case Applicability . 8
Annex A (normative): ICS proforma for Mission Critical Services Client . 33
A.1 Guidance for completing the ICS proforma . 33
A.1.1 Purposes and structure . 33
A.1.2 Abbreviations and conventions . 33
A.1.3 Instructions for completing the ICS proforma . 34
A.2 Identification of the MCX Client Equipment . 34
A.2.1 Date of the statement . 34
A.2.2 MCX Client under test identification . 34
A.2.3 Product supplier . 34
A.2.4 The Organisation responsible for the Product testing . 35
A.2.5 ICS contact person . 35
A.3 Identification of the protocol . 36
A.4 ICS proforma tables. 36
A.4.1 Implementation Types . 36
A.4.2 Additional information . 37
Annex B (informative): Change history . 40
History . 42

ETSI
3GPP TS 37.579-4 version 17.5.0 Release 17 4 ETSI TS 137 579-4 V17.5.0 (2026-04)
Foreword
This Technical Specification has been produced by the 3rd 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.
The present document is part 1 of a multi-part deliverable covering conformance test specification for Mission
Critical Services consisting of:
3GPP TS 37.579-1 [2]: "Mission Critical (MC) services protocol conformance testing; Part 1: Common test
environment"
3GPP TS 37.579-2 [3]: "Mission Critical (MC) services conformance testing; Part 2: Mission Critical Push To
Talk (MCPTT) User Equipment (UE) Protocol conformance specification"
3GPP TS 37.579-4: "Mission Critical (MC) services conformance testing; Part 4: Test Applicability and
Implementation Conformance Statement (ICS) proforma specification" (the present document)
3GPP TS 37.579-5 [5]: "Mission Critical (MC) services conformance testing; Part 5: Abstract test suite (ATS)"
3GPP TS 37.579-6 [11]: "Mission Critical (MC) services; Part 6: Mission Critical Video (MCVideo) User
Equipment (UE) Protocol conformance specification".
3GPP TS 37.579-7 [12]: "Mission Critical (MC) services; Part 7: Mission Critical Data (MCData) User
Equipment (UE) Protocol conformance specification".
In the present document, modal verbs have the following meanings:
shall indicates a mandatory requirement to do something
shall not indicates an interdiction (prohibition) to do something
The constructions "shall" and "shall not" are confined to the context of normative provisions, and do not appear in
Technical Reports.
The constructions "must" and "must not" are not used as substitutes for "shall" and "shall not". Their use is avoided
insofar as possible, and they are not used in a normative context except in a direct citation from an external, referenced,
non-3GPP document, or so as to maintain continuity of style when extending or modifying the provisions of such a
referenced document.
should indicates a recommendation to do something
should not indicates a recommendation not to do something
may indicates permission to do something
need not indicates permission not to do something
ETSI
3GPP TS 37.579-4 version 17.5.0 Release 17 5 ETSI TS 137 579-4 V17.5.0 (2026-04)
The construction "may not" is ambiguous and is not used in normative elements. The unambiguous constructions
"might not" or "shall not" are used instead, depending upon the meaning intended.
can indicates that something is possible
cannot indicates that something is impossible
The constructions "can" and "cannot" are not substitutes for "may" and "need not".
will indicates that something is certain or expected to happen as a result of action taken by an agency
the behaviour of which is outside the scope of the present document
will not indicates that something is certain or expected not to happen as a result of action taken by an
agency the behaviour of which is outside the scope of the present document
might indicates a likelihood that something will happen as a result of action taken by some agency the
behaviour of which is outside the scope of the present document
might not indicates a likelihood that something will not happen as a result of action taken by some agency
the behaviour of which is outside the scope of the present document
In addition:
is (or any other verb in the indicative mood) indicates a statement of fact
is not (or any other negative verb in the indicative mood) indicates a statement of fact
The constructions "is" and "is not" do not indicate requirements.
ETSI
3GPP TS 37.579-4 version 17.5.0 Release 17 6 ETSI TS 137 579-4 V17.5.0 (2026-04)
1 Scope
The present document provides the Implementation Conformance Statement (ICS) proforma for testing Client
implementations for compliance to the Mission Critical Services protocol requirements defined by 3GPP, and in
accordance with the relevant guidance given in ISO/IEC 9646-1 [7] and ISO/IEC 9646-7 [8].
The present document specifies the recommended applicability statement for the test cases included in 3GPP
TS 37.579-2 [3], as well as, TS 37.579-6 [3] and 3GPP TS 37.579-7 [12]. These applicability statements are based on
the features implemented in the Client.
The present document is valid for Mission Critical Services Clients implemented according to 3GPP releases starting
from Release 13 up to the Release indicated on the cover page of the present document.
The present document is valid for Mission Critical Video (MCVideo) and Mission Critical Data (MCData) Clients
implemented according to 3GPP releases starting from Release 14 up to the Release indicated on the cover page of the
present document.
The present document does not specify applicability or ICS for protocol conformance testing for the 3GPP bearers
which carry the Mission Critical Services data sent or received by the Client. These are defined in TS 36.523-2 [6] for
EPS (LTE) or TS 38.523-2 [20] for NR/5GC.
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 37.579-1: "Mission Critical (MC) services; Part 1: Common test environment".
[3] 3GPP TS 37.579-2: "Mission Critical (MC) services; Part 2: Mission Critical Push To Talk
(MCPTT) User Equipment (UE) Protocol conformance specification".
[4] void
[5] 3GPP TS 37.579-5: "Mission Critical (MC) services; Part 5: Abstract test suite (ATS)".
[6] 3GPP TS 36.523-2: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Packet
Core (EPC); User Equipment (UE) conformance specification; Part 2: Implementation
Conformance Statement (ICS) proforma specification".
[7] ISO/IEC 9646-1: "Information technology - Open Systems Interconnection - Conformance testing
methodology and framework - Part 1: General concepts".
[8] ISO/IEC 9646-7: "Information technology - Open systems interconnection - Conformance testing
methodology and framework - Part 7: Implementation Conformance Statements".
[9] 3GPP TS 23.179: "Functional architecture and information flows to support mission critical
communication services; Stage 2".
[10] 3GPP TS 23.401: "3GPP System Architecture Evolution; GPRS enhancements for E-UTRAN
access".
ETSI
3GPP TS 37.579-4 version 17.5.0 Release 17 7 ETSI TS 137 579-4 V17.5.0 (2026-04)
[11] 3GPP TS 37.579-6: "Mission Critical (MC) services; Part 6: Mission Critical Video (MCVideo)
User Equipment (UE) Protocol conformance specification".
[12] 3GPP TS 37.579-7: "Mission Critical (MC) services; Part 7: Mission Critical Data (MCData) User
Equipment (UE) Protocol conformance specification".
[13] 3GPP TS 23.379: "Functional architecture and information flows to support Mission Critical Push
To Talk (MCPTT); Stage 2".
[14] 3GPP TS 33.180: "Security of the mission critical service".
[15] 3GPP TS 24.379: "Mission Critical Push To Talk (MCPTT) call control; Protocol specification".
[16] 3GPP TS 24.380: "Mission Critical Push To Talk (MCPTT) floor control; Protocol specification".
[17] 3GPP TS 24.581: "Mission Critical Video (MCVideo) media plane control; Protocol
specification".
[18] 3GPP TS 24.282: "Mission Critical Data (MCData) signalling control; Protocol specification".
[19] 3GPP TS 24.281: "Mission Critical Video (MCVideo) signalling control; Protocol specification".
[20] 3GPP TS 38.523-2: "5GS; User Equipment (UE) conformance specification; Part 2: Applicability
of protocol test cases".
3 Definitions of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [1] and the following
apply. A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP
TR 21.905 [1].
In addition for the purposes of the present document, the following terms, definitions, symbols and abbreviations apply:
- such given in ISO/IEC 9646-1 [7] and ISO/IEC 9646-7 [8].
NOTE: Some terms and abbreviations defined in [7] and [8] are explicitly included below with small
modification to reflect the terminology used in 3GPP.
Implementation Conformance Statement (ICS): A statement made by the supplier of an implementation or system
claimed to conform to a given specification, stating which capabilities have been implemented.
ICS proforma: A document, in the form of a questionnaire, which when completed for an implementation or system
becomes an ICS.
Implementation eXtra Information for Testing (IXIT): A statement made by a supplier or implementer of an UEUT
which contains or references all of the information (in addition to that given in the ICS) related to the UEUT and its
testing environment, which will enable the test laboratory to run an appropriate test suite against the UEUT.
IUT containing MCX Client: A statement identifying which entity, and associated requirements, from the MCX
service architecture is subject of testing. Depending on the TS 37.579-5[5] test model being used, the LTE UE (with the
MCX Client installed) is considered as the IUT (MCX EUTRA test model), the 5GS UE (with the MCX Client
installed) is considered as the IUT (MCX NR/5GC test model), or, only the MCX Client is considered as the IUT
(MCX IPCAN test model). In all cases the SUT is the UE, communicating with the SS over the Uu radio interface.
IXIT proforma: A document, in the form of a questionnaire, which when completed for an UEUT becomes an IXIT.
Protocol Implementation Conformance Statement (PICS): An ICS for an implementation or system claimed to
conform to a given protocol specification.
Protocol Implementation eXtra Information for Testing (PIXIT): An IXIT related to testing for conformance to a
given protocol specification.
ETSI
3GPP TS 37.579-4 version 17.5.0 Release 17 8 ETSI TS 137 579-4 V17.5.0 (2026-04)
static conformance review: A review of the extent to which the static conformance requirements are claimed to be
supported by the UEUT, by comparing the answers in the ICS(s) with the static conformance requirements expressed in
the relevant specification(s).
3.2 Symbols
Void
3.3 Abbreviations
For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 [1] and the following apply. An
abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in
3GPP TR 21.905 [1].
FFS For Further Study
ICS Implementation Conformance Statement
IUT Implementation Under Test
IXIT Implementation eXtra Information for Testing
MC Mission Critical
MCData Mission Critical Data
MCPTT Mission Critical Push To Talk
MCVideo Mission Critical Video
MCX Mission Critical X, with X = PTT or X= Video or X= Data
SCS System Conformance Statement
SS System Simulator
SUT System Under Test
TC Test Case
4 Recommended Test Case Applicability
The applicability of each individual test is identified in Table 4-1 (MCPTT Client), Table 4-3 (MCVideo Client), Table
4-4 (MCData Client). This is just a recommendation based on the purpose for which the test case was written.
The applicability of every test is formally expressed by the use of Boolean expression that are based on parameters
(ICS) included in annex A of the present document.
Additional information related to the Test Case (TC), e.g. affecting its dynamic behaviour or its execution may be
provided as well
The columns in Table 4-1, Table 4-3, Table 4-4 have the following meaning:
Clause
The clause column indicates the clause number in TS 37.579-2 [3] or TS 37.579-6 [11] or TS 37.579-7 [12] respectively
which contains the test body.
Title
The title column describes the name of the test and contains the clause title of the clause in TS 37.579-2 [3] or TS
37.579-6 [11] or TS 37.579-7 [12] respectively which contains the test body.
Release MCX
The Release MCX column indicates the earliest release (release of the MC functionality) from which the test case is
applicable. In some specific cases it may indicate the release(s) for which the TC is only applicable.
Note: Some exceptions to this interpretation may be indicated in Notes in column 'Number of TC Executions'.
ETSI
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Applicability - Condition
The following notations are used for the applicability column:
R recommended - the test case is recommended
O optional – the test case is optional
N/A not applicable - in the given context, the test case is not recommended.
Ci conditional - the test is recommended ("R") or not ("N/A") depending on the support of other
items. "i" is an integer identifying a unique conditional status expression which is defined
immediately following the table. For nested conditional expressions, the syntax "IF . THEN (IF .
THEN . ELSE.) ELSE ." is used to avoid ambiguities.
NOTE: The conditions are defined in Table 4-1a (MCPTT Client), Table 4-3a (MCVideo Client), Table 4-4a
(MCData Client) respectively.
Applicability - Comments
This column contains a verbal description of the condition.
Additional Information - Specific ICS
This column contains the mnemonics of ICS(s) affecting the dynamic behaviour of the TC.
NOTE: ICS items specified in other test specifications can be referred, to avoid redundant definitions.
Additional Information - Specific IXIT
This column contains the mnemonics of IXIT(s) affecting the dynamic behaviour of the TC. IXITs are defined in
TS 37.579-5 [6]
Additional Information - Number of TC Executions
This column contains, wherever applicable, the recommended for certification purposes number of TC
executions. It may contain also other information e.g. exceptions to the release applicable to the test. Clarifying
notes when available are listed in dedicated tables with table numbers having the suffix "b" e.g. Table 4-1b
(MCPTT Client).
Release RAT
The Release RAT column indicates the earliest release of the RAT bearer over which the test should be conducted. In
the present specification the RAT is either E-UTRA or NR. Note that the release of the MC functionality does not have
to align with that of the E-UTRA or NR bearer. In case the Release RAT column is empty, the release version specified
in the Release column (release of the MC functionality) applies.
ETSI
3GPP TS 37.579-4 version 17.5.0 Release 17 10 ETSI TS 137 579-4 V17.5.0 (2026-04)
Table 4-1: Applicability of MCPTT Client tests and additional information for testing
Clause TC Title Release Applicability Additional
MCX Information
Condition Comment Specific ICS Specific IXIT Number of TC Release RAT
Executions
5 MCPTT Client Configuration
5.1 Configuration / Authentication / User Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Authorisation / UE Configuration / User NR: Rel-15
Profile / Key Generation
5.2 Configuration / Group Creation / Group Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Regroup Creation / Group Regroup NR: Rel-15
Teardown
5.3 Configuration / Group Affiliation / Remote Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
change / De-affiliation / Home MCPTT NR: Rel-15
system
Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
5.4 Configuration / Pre-established Session
Establishment / Pre-established Session NR: Rel-15
Modification / Pre-established Session
Release
5.5 Configuration / Determination of MCPTT Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Service Settings / Current Active MCPTT NR: Rel-15
Settings / De-subscribe
5.6 Configuration / Download CSK Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
NR: Rel-15
5.7 Configuration / Subscription to group Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
dynamic data / De-subscribe NR: Rel-15
5.8 Configuration / Functional Alias / Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Functional alias status determination / NR: Rel-15
Activate functional alias / Deactivate
functional alias
5.9 Configuration / Functional Alias / Location Rel-16 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
based functional alias status change NR: Rel-15
5.10 Configuration / Rules based affiliation Rel-16 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
status change NR: Rel-15
6 MCPTT Client on-network operation

6.1 Group Calls
6.1.1 Pre-arranged Group Call
6.1.1.1 On-network / On-demand Pre-arranged Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / Automatic Commencement NR: Rel-15
Mode / End-to-end communication security
/ Floor Control / Upgrade to Emergency
Group Call / Cancel Emergency State /
Upgrade to Imminent Peril Group Call /
Cancel Imminent Peril State / Client
Originated (CO)
6.1.1.2 On-network / On-demand Pre-arranged Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / Automatic Commencement NR: Rel-15
Mode / Floor Control / Upgrade to
Emergency Group Call / Cancel
Emergency State / Upgrade to Imminent
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Clause TC Title Release Applicability Additional
MCX Information
Condition Comment Specific ICS Specific IXIT Number of TC Release RAT
Executions
Peril Group Call / Cancel Imminent Peril
State / Client Terminated (CT)
6.1.1.3 On-network / On-demand Pre-arranged Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / Manual Commencement NR: Rel-15
Mode / Client Originated (CO)
6.1.1.4 On-network / On-demand Pre-arranged Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / Manual Commencement NR: Rel-15
Mode / Client Terminated (CT)
6.1.1.5 On-network / Pre-arranged Group Call Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
using pre-established session / Client NR: Rel-15
originated Pre-established Session
Release with associated MCPTT session /
Client Originated (CO)
Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
6.1.1.6 On-network / Pre-arranged Group Call
using pre-established session / Automatic NR: Rel-15
Commencement Mode / Server originated
Pre-established Session Release with
associated MCPTT session / Client
Terminated (CT)
6.1.1.7 On-network / Pre-arranged Group Call Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
using pre-established session / Manual NR: Rel-15
Commencement Mode / Client Terminated
(CT)
6.1.1.8 On-network / Pre-arranged Broadcast Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / Client Originated (CO) NR: Rel-15
6.1.1.9 On-network / Pre-arranged Broadcast Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / Client Terminated (CT) NR: Rel-15
6.1.1.10 On-network / Broadcast Group Call with Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Temporary Group / Client Originated (CO) NR: Rel-15
6.1.1.11 On-network / Pre-arranged Emergency Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / Client Originated (CO) NR: Rel-15
6.1.1.12 On-network / Pre-arranged Emergency Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / Client Terminated (CT) NR: Rel-15
6.1.1.13 On-network / Pre-Arranged Imminent Peril Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / Client Originated (CO) NR: Rel-15
6.1.1.14 On-network / Pre-Arranged Imminent Peril Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / Client Terminated (CT) NR: Rel-15
6.1.1.15 On-network / Emergency Alert / Cancel Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Emergency Alert / Client Originated (CO) NR: Rel-15
6.1.1.16 On-network / Emergency Alert / Client Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Terminated (CT) NR: Rel-15
6.1.1.17 On-network / Broadcast Group Call using Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
pre-established session / Client originated NR: Rel-15
Pre-established Session Release with
associated MCPTT session / Client
Originated (CO)
6.1.1.18 On-network / Broadcast Group Call using Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
pre-established session / Automatic NR: Rel-15
ETSI
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Clause TC Title Release Applicability Additional
MCX Information
Condition Comment Specific ICS Specific IXIT Number of TC Release RAT
Executions
Commencement Mode / Server originated
Pre-established Session Release with
associated MCPTT session / Client
Terminated (CT)
6.1.1.19 On-network / On-demand Pre-arranged Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / Active functional alias / Client NR: Rel-15
Originated (CO)
6.1.1.20 On-network / On-demand Pre-arranged Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / Multi Talker NR: Rel-15
6.1.1.21 On-network / On-demand Pre-arranged Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / No Implicit Floor Control / NR: Rel-15
Client Originated (CO)
6.1.1.22 On-network / On-demand Pre-arranged Rel-17 C01 IUT containing MCPTT Client
E-UTRA: Rel-
Group Call / Preconfigured Group Use
Only
NR: Rel-15
6.1.2 Chat Group Calls
6.1.2.1 Void
6.1.2.2 On-network / Chat Group Call Using Pre- Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
established Session Including Emergency NR: Rel-15
and Imminent Peril Calls / Client Server
originated Pre-established Session
Release with associated MCPTT session /
Client Origination (CO)
6.1.2.3 Void
6.1.2.4 Void
6.1.2.5 Void
6.1.2.6 Void
6.1.2.7 On-network / Chat Group Call / Emergency Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / Client Originated (CO) NR: Rel-15
6.1.2.8 On-network / Chat Group Call / Emergency Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call / Client Terminated (CT) NR: Rel-15
6.1.2.9 On-network / Chat Group Call / Imminent Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Peril Group Call / Client Originated (CO) NR: Rel-15
6.1.2.10 On-network / Chat Group Call / Imminent Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Peril Group Call / Client Terminated (CT) NR: Rel-15
6.1.2.11 On-network / Chat Group Call / Join Chat Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Session / Upgrade to Emergency / NR: Rel-15
Cancel Emergency / Upgrade to Imminent
Peril / Cancel Imminent Peril / Client
Originated (CO)
6.1.2.12 On-network / Chat Group Call / Join Chat Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Session / Upgrade to Emergency / NR: Rel-15
Cancel Emergency / Upgrade to Imminent
Peril / Cancel Imminent Peril / Client
Originated (CT)
6.1.2.13 On-network / Chat Group Call / Join Chat Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Session / Active functional alias / NR: Rel-15
Client Originated (CO)
ETSI
3GPP TS 37.579-4 version 17.5.0 Release 17 13 ETSI TS 137 579-4 V17.5.0 (2026-04)
Clause TC Title Release Applicability Additional
MCX Information
Condition Comment Specific ICS Specific IXIT Number of TC Release RAT
Executions
6.1.2.14 On-network / Chat Group Call / Chat Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group Call Using Pre-established Session NR: Rel-15
/ Active functional alias / Client Originated
(CO)
6.1.3 Conference Event Package
6.1.3.1 On-network / Conference Event Package / Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Subscription to Conference Event Package NR: Rel-15
/ Termination of subscription
6.1.4 Remote Change of Selected Group
6.1.4.1 On-network / Remote Change of Selected Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group / Selected Group Change of NR: Rel-15
Targeted User / Client Originated (CO)
6.1.4.2 On-network / Remote Change of Selected Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Group / Selected Group Change of NR: Rel-15
Targeted User / Client Terminated (CT)
6.1.5 Remotely initiated group call
6.1.5.1 On-network / Remotely initiated group call / Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Client Originated (CO) NR: Rel-15
6.1.5.2 On-network / Remotely initiated group call / Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Client Terminated (CT) NR: Rel-15
6.2 Private Calls
6.2.1 On-network / Private Call / On-demand / Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Automatic Commencement Mode / With NR: Rel-15
Floor Control / Upgrade to Emergency Call
/ Cancellation of Emergency on User
request / Client Originated (CO)
Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
6.2.2 On-network / Private Call / On-demand /
Automatic Commencement Mode / With NR: Rel-15
Floor Control / Upgrade to Emergency Call
/ Cancellation of Emergency on User
request / Client Terminated (CT)
6.2.3 On-network / Private Call / On-demand / Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Automatic Commencement Mode / Without NR: Rel-15
Floor Control / Client Originated (CO)
6.2.4 On-network / Private Call / On-demand / Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Automatic Commencement Mode / Without NR: Rel-15
Floor Control / Client Terminated (CT)
6.2.5 On-network / Private Call / Emergency Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Private Call / On-demand / Automatic NR: Rel-15
Commencement Mode / Force of
automatic commencement mode / Without
Floor Control / Client Originated (CO)
6.2.6 On-network / Private Call / Emergency Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Private Call / On-demand / Automatic NR: Rel-15
Commencement Mode / Force of
automatic commencement mode / Without
Floor Control / Client Terminated (CT)
ETSI
3GPP TS 37.579-4 version 17.5.0 Release 17 14 ETSI TS 137 579-4 V17.5.0 (2026-04)
Clause TC Title Release Applicability Additional
MCX Information
Condition Comment Specific ICS Specific IXIT Number of TC Release RAT
Executions
6.2.7 On-network / Private Call / On-demand / Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Manual Commencement Mode / Without NR: Rel-15
Floor Control / Client Originated (CO)
6.2.8 On-network / Private Call / On-demand / Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Manual Commencement Mode / Without NR: Rel-15
Floor Control / Client Terminated (CT)
6.2.9 On-network / Private Call / Within a pre- Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
established session / Automatic NR: Rel-15
Commencement Mode / Without Floor
Control / Client Originated (CO)
6.2.10 On-network / Private Call / Within a pre- Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
established session / Automatic NR: Rel-15
Commencement Mode / Without Floor
Control / Client Terminated (CT)
6.2.11 On-network / Private Call / Within a pre- Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
established session / Manual NR: Rel-15
Commencement Mode / Without Floor
Control / Release of the Call and the pre-
established session / Client Terminated
(CT)
6.2.12 On-network / Private Call / Private Call Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Call-Back Request / Private Call Call-Back NR: Rel-15
Cancel Request / Client Originated (CO) /
Private call call-back fulfilment
6.2.13 On-network / Private Call / Private Call Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Call-Back Request / Private Call Call-Back NR: Rel-15
Cancel Request / Client Terminated (CT) /
Private call call-back fulfilment
6.2.14 On-network / Private Call / Ambient Rel-14 C06 IUT containing MCPTT Client and  E-UTRA: Rel-12
listening call / Remotely initiated Ambient supports ambient listening call NR: Rel-15
listening call / Remotely initiated ambient
listening call release / Success / Client
Originated (CO) / Server initiated ambient
call release
6.2.15 On-network / Private Call / Ambient Rel-14 C06 IUT containing MCPTT Client and  E-UTRA: Rel-12
listening call / Remotely initiated Ambient supports ambient listening call NR: Rel-15
listening call / Remotely initiated ambient
listening call release / Success / Client
Terminated (CT)
6.2.16 On-network / Private Call / Ambient Rel-14 C06 IUT containing MCPTT Client and  E-UTRA: Rel-12
listening call / Locally initiated Ambient supports ambient listening call NR: Rel-15
listening call / Locally initiated ambient
listening call release / Success / Client
Originated (CO) / Server initiated ambient
call release
6.2.17 On-network / Private Call / Ambient Rel-14 C06 IUT containing MCPTT Client and  E-UTRA: Rel-12
listening call / Locally initiated Ambient supports ambient listening call NR: Rel-15
listening call / Locally initiated ambient
ETSI
3GPP TS 37.579-4 version 17.5.0 Release 17 15 ETSI TS 137 579-4 V17.5.0 (2026-04)
Clause TC Title Release Applicability Additional
MCX Information
Condition Comment Specific ICS Specific IXIT Number of TC Release RAT
Executions
listening call release / Success / Client
Terminated (CT)
6.2.18 On-network / Private call / Ambient Rel-15 C06 IUT containing MCPTT Client and  E-UTRA: Rel-12
listening call / Remote initiated ambient supports ambient listening call NR: Rel-15
listening call / Pre-established session /
Ambient listening call release / Client
Originated (CO)
6.2.19 On-network / Private call / Ambient Rel-15 C06 IUT containing MCPTT Client and  E-UTRA: Rel-12
listening call / Remote initiated ambient supports ambient listening call NR: Rel-15
listening call / Pre-established session /
Ambient listening call release / Client
Terminated (CT)
6.2.20 On-network / First-to-answer call / On- Rel-15 C04 IUT containing MCPTT Client and the UE  E-UTRA: Rel-12
demand session / Client Originated (CO) uses on-demand sessions for initiating NR: Rel-15
First-to-answer calls
6.2.21 On-network / First-to-answer call / On- Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
demand session / Client Terminated (CT) NR: Rel-15
6.2.22 On-network / First-to-answer call / Pre- Rel-15 C05 IUT containing MCPTT Client and the UE  E-UTRA: Rel-12
established session / Client Originated uses pre-established sessions for NR: Rel-15
(CO) initiating First-to-answer calls
6.2.23 On-network / First-to-answer call / Pre- Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
established session / Client Terminated NR: Rel-15
(CT)
6.2.24 On-network / Private call / Remotely Rel-15 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
initiated private call / Client Originated NR: Rel-15
(CO)
6.2.25 On-network / Private call / Remotely Rel-15 C02 IUT containing MCPTT Client and the UE  E-UTRA: Rel-12
initiated private call / On-demand session / uses on-demand sessions for Remotely NR: Rel-15
Client Terminated (CT) initiated Private calls
6.2.26 On-network / Private call / Remotely Rel-15 C03 IUT containing MCPTT Client and the UE  E-UTRA: Rel-12
initiated private call / Pre-established uses pre-established sessions for NR: Rel-15
session / Client Terminated (CT) Remotely initiated Private calls
6.3 Location
6.3.1 On-network / Location / Event Triggered Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Location Information Report NR: Rel-15
6.3.2 On-network / Location / On-demand Rel-14 C01 IUT containing MCPTT Client  E-UTRA: Rel-12
Location Information Request NR: Rel-15
6.4 MBMS
6.4.1 On-network / MBMS / MBMS Bearer Rel-14 C07 IUT containing MCPTT Client and  E-UTRA: Rel-12
Announcement / MBMS Bearer Listening supports MC services over MBMS NR: Rel-15
Status / Transition to MBMS from Unicast /
MBMS Floor Control / Transition to Unicast
from MBMS
6.4.2 On-network / MBMS / Multi Talker Rel-15 C07 IUT containing MCPTT Client and  E-UTRA: Rel-12
supports MC services over MBMS NR: Rel-15
6.5 Regroup using a preconfigured group
6.5.1 On-network / R
...