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TECHNICAL SPECIFICATION
LTE;
Mission Critical Push To Talk (MCPTT) call control;
Protocol specification
(3GPP TS 24.379 version 15.5.0 Release 15)
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3GPP TS 24.379 version 15.5.0 Release 15 1 ETSI TS 124 379 V15.5.0 (2019-04)
Reference
RTS/TSGC-0124379vf50
Keywords
LTE
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3GPP TS 24.379 version 15.5.0 Release 15 2 ETSI TS 124 379 V15.5.0 (2019-04)
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
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Foreword
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, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
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 24.379 version 15.5.0 Release 15 3 ETSI TS 124 379 V15.5.0 (2019-04)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 23
1 Scope . 24
2 References . 24
3 Definitions, symbols and abbreviations . 27
3.1 Definitions . 27
3.2 Abbreviations . 30
4 General . 30
4.1 MCPTT overview . 30
4.2 URI and address assignments . 32
4.3 MCPTT speech . 32
4.4 Warning Header Field . 32
4.4.1 General . 32
4.4.2 Warning texts . 32
4.5 MCPTT session identity . 36
4.6 MCPTT priority calls and alerts . 36
4.6.1 MCPTT emergency group calls . 36
4.6.2 MCPTT emergency private calls . 38
4.6.3 MCPTT emergency alerts . 39
4.6.4 MCPTT imminent peril group call . 40
4.7 Communication security . 41
4.7.1 Media security . 41
4.7.2 Signalling security . 41
4.8 Protection of sensitive application data. . 43
4.9 Pre-established session . 46
4.10 MCPTT client ID . 47
4.11 Off-network MCPTT . 47
4.12 Broadcast Group Calls . 47
5 Functional entities . 47
5.1 Introduction . 47
5.2 MCPTT client . 47
5.3 MCPTT server . 49
5.3.1 General . 49
5.3.2 Functional connectivity models . 50
5.3.3 Failure case . 52
5.3.4 Management of MBMS bearers . 52
5.4 MCPTT UE-to-network relay. 52
6 Common procedures. 52
6.1 Introduction . 52
6.2 MCPTT client procedures . 52
6.2.0 Distinction of requests at the MCPTT client . 52
6.2.0.1 SIP MESSAGE request . 52
6.2.1 SDP offer generation . 54
6.2.2 SDP answer generation . 54
6.2.3 Commencement modes . 55
6.2.3.1 Automatic commencement mode . 55
6.2.3.1.1 Automatic commencement mode for private calls . 55
6.2.3.1.2 Automatic commencement mode for group calls . 56
6.2.3.2 Manual commencement mode . 56
6.2.3.2.1 Manual commencement mode for private calls . 56
6.2.3.2.2 Manual commencement mode for group calls . 56
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3GPP TS 24.379 version 15.5.0 Release 15 4 ETSI TS 124 379 V15.5.0 (2019-04)
6.2.4 Leaving an MCPTT session initiated by MCPTT client . 57
6.2.4.1 On-demand session case . 57
6.2.4.2 Pre-established session case . 57
6.2.5 Releasing an MCPTT session initiated by MCPTT client . 57
6.2.5.1 On-demand session case . 57
6.2.5.2 Pre-established session case . 58
6.2.6 Receiving an MCPTT session release request . 58
6.2.7 Void . 58
6.2.8 Priority call conditions . 58
6.2.8.0 General . 58
6.2.8.1 MCPTT emergency group call conditions . 58
6.2.8.1.1 SIP INVITE request or SIP REFER request for originating MCPTT emergency group calls . 58
6.2.8.1.2 Resource-Priority header field for MCPTT emergency group calls . 59
6.2.8.1.3 SIP re-INVITE request for cancelling MCPTT in-progress emergency group state . 60
6.2.8.1.4 Receiving a SIP 2xx response to a SIP request for a priority call . 61
6.2.8.1.5 Receiving a SIP 4xx response, SIP 5xx response or SIP 6xx response to a SIP request for a
priority group call . 61
6.2.8.1.6 Determining authorisation for initiating or cancelling an MCPTT emergency alert . 62
6.2.8.1.7 Determining authorisation for cancelling the in-progress emergency state of an MCPTT
group . 62
6.2.8.1.8 Determining authorisation for originating a priority group call . 62
6.2.8.1.9 SIP request for originating MCPTT imminent peril group calls . 63
6.2.8.1.10 Determining authorisation for cancelling an imminent peril group call . 63
6.2.8.1.11 SIP re-INVITE request for cancelling MCPTT in-progress imminent peril group state . 64
6.2.8.1.12 Resource-Priority header field for MCPTT imminent peril group calls . 64
6.2.8.1.13 Receiving a SIP INFO request in the dialog of a SIP request for a priority group call . 64
6.2.8.1.14 SIP re-INVITE request for cancelling the in-progress emergency group state of a group by a
third-party . 65
6.2.8.1.15 Retrieving Resource-Priority header field values . 66
6.2.8.1.16 Handling receipt of a SIP re-INVITE request for priority group call origination status within
a pre-established session . 66
6.2.8.1.17 Priority group call conditions upon receiving call release . 67
6.2.8.1.18 Emergency private call conditions upon receiving call release . 68
6.2.8.2 Request for an originating broadcast group call . 68
6.2.8.3 MCPTT emergency private call conditions . 68
6.2.8.3.1 Authorisations . 68
6.2.8.3.1.1 Determining authorisation for initiating an MCPTT emergency private call . 68
6.2.8.3.1.2 Determining authorisation for cancelling an MCPTT emergency private call . 68
6.2.8.3.1.3 Determining authorisation for initiating or cancelling an MCPTT emergency alert to a
MCPTT user . 69
6.2.8.3.2 SIP request for originating MCPTT emergency private calls . 69
6.2.8.3.3 Resource-Priority header field for MCPTT emergency private calls . 69
6.2.8.3.4 Receiving a SIP 2xx response to a SIP request for an MCPTT emergency private call . 70
6.2.8.3.5 Receiving a SIP 4xx response, SIP 5xx response or SIP 6xx response to a SIP request for an
MCPTT emergency private call. 70
6.2.8.3.6 SIP re-INVITE request for cancelling MCPTT emergency private call state. 70
6.2.8.3.7 Receiving a SIP INFO request in the dialog of a SIP request for a priority private call. 71
6.2.8.3.8 SIP re-INVITE request for cancelling the MCPTT emergency private call state by a third-
party . 72
6.2.8.3.9 Retrieving a KMS URI associated with an MCPTT ID . 72
6.2.9 Location information . 73
6.2.9.1 Location information for location reporting . 73
6.3 MCPTT server procedures . 74
6.3.1 Distinction of requests sent to the MCPTT server . 74
6.3.1.1 SIP INVITE request . 74
6.3.1.2 SIP REFER request . 75
6.3.1.3 SIP MESSAGE request . 75
6.3.1.4 SIP SUBSCRIBE request . 78
6.3.2 Participating MCPTT Function. 78
6.3.2.1 Requests initiated by the served MCPTT user . 78
6.3.2.1.1 SDP offer generation . 78
6.3.2.1.1.1 On-demand session . 78
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3GPP TS 24.379 version 15.5.0 Release 15 5 ETSI TS 124 379 V15.5.0 (2019-04)
6.3.2.1.1.2 Pre-established session. 78
6.3.2.1.2 SDP answer generation . 79
6.3.2.1.2.1 On-demand session . 79
6.3.2.1.2.2 Pre-established session establishment . 79
6.3.2.1.3 Sending an INVITE request on receipt of an INVITE request . 79
6.3.2.1.4 Sending an INVITE request on receipt of a REFER request . 80
6.3.2.1.5 Response to an INVITE request . 82
6.3.2.1.5.1 Provisional responses . 82
6.3.2.1.5.2 Final response . 82
6.3.2.1.6 Sending a SIP BYE request on receipt of a SIP BYE request . 82
6.3.2.1.7 Sending a SIP BYE request on receipt of a SIP REFER request . 83
6.3.2.1.8 Priority call conditions . 84
6.3.2.1.8.0 General . 84
6.3.2.1.8.1 Determining authorisation for originating a priority group call . 84
6.3.2.1.8.2 Determining authorisation for initiating or cancelling an MCPTT emergency alert . 84
6.3.2.1.8.3 Validate priority request parameters . 85
6.3.2.1.8.4 Retrieving Resource-Priority header field values . 85
6.3.2.1.8.5 Generating a SIP re-INVITE request for priority group call origination within a pre-
established session . 85
6.3.2.1.8.6 Generating a SIP re-INVITE request for emergency private call origination within a pre-
established session . 86
6.3.2.1.8.7 Generating a SIP re-INVITE request for first-to-answer call origination within a pre-
established session . 87
6.3.2.1.9 Generating a SIP re-INVITE request on receipt of a SIP re-INVITE request . 87
6.3.2.1.10 Sending a SIP INVITE request on receipt of SIP 3xx response . 88
6.3.2.2 Requests terminated to the served MCPTT user . 89
6.3.2.2.1 SDP offer generation . 89
6.3.2.2.2 SDP answer generation . 89
6.3.2.2.2.1 On-demand session . 89
6.3.2.2.2.2 Pre-established session. 89
6.3.2.2.3 SIP INVITE request towards the terminating MCPTT client . 89
6.3.2.2.4 Response to a SIP INVITE request . 90
6.3.2.2.4.1 Provisional response . 90
6.3.2.2.4.2 Final response . 90
6.3.2.2.5 Automatic Commencement Mode . 91
6.3.2.2.5.1 General . 91
6.3.2.2.5.2 Automatic commencement for On-Demand session . 91
6.3.2.2.5.3 Automatic commencement for pre-established session . 92
6.3.2.2.6 Manual Commencement Mode . 93
6.3.2.2.6.1 General . 93
6.3.2.2.6.2 Manual commencement for On-Demand session . 94
6.3.2.2.6.3 Manual commencement for Pre-established session . 95
6.3.2.2.7 Void . 97
6.3.2.2.8 SIP BYE request towards the terminating MCPTT client . 97
6.3.2.2.8.1 On-demand. 97
6.3.2.2.8.2 Using pre-established session . 97
6.3.2.2.9 Populate MIME bodies . 97
6.3.2.2.10 Generating a SIP re-INVITE request towards the terminating MCPTT client . 98
6.3.2.2.11 Generating a SIP MESSAGE request towards the terminating MCPTT client . 98
6.3.2.3 Void. 98
6.3.3 Controlling MCPTT function . 98
6.3.3.1 Request initiated by the controlling MCPTT function . 98
6.3.3.1.1 SDP offer generation . 98
6.3.3.1.2 Sending an INVITE request . 99
6.3.3.1.3 Receipt of a SIP response to a SIP INVITE request . 99
6.3.3.1.3.1 Final response .
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