ETSI TS 124 379 V14.15.0 (2022-07)

LTE ; Mission Critical Push To Talk (MCPTT) call control; Protocol specification (3GPP TS 24.379 version 14.15.0 Release 14)

RTS/TSGC-0124379vef0

General Information

• Status: Not Published
• Technical Committee: 3GPP CT 1 - MM/CC/SM [lu] (formely CN1)
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Completion Date: 26-Jul-2022

Standards Content (Sample)

ETSI TS 124 379 V14.15.0 (2022-07)






TECHNICAL SPECIFICATION
LTE;
Mission Critical Push To Talk (MCPTT) call control;
Protocol specification
(3GPP TS 24.379 version 14.15.0 Release 14)

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3GPP TS 24.379 version 14.15.0 Release 14 1 ETSI TS 124 379 V14.15.0 (2022-07)

Reference
RTS/TSGC-0124379vef0
Keywords
LTE
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ETSI

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3GPP TS 24.379 version 14.15.0 Release 14 2 ETSI TS 124 379 V14.15.0 (2022-07)
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ETSI

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3GPP TS 24.379 version 14.15.0 Release 14 3 ETSI TS 124 379 V14.15.0 (2022-07)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 22
1 Scope . 23
2 References . 23
3 Definitions, symbols and abbreviations . 26
3.1 Definitions . 26
3.2 Abbreviations . 28
4 General . 29
4.1 MCPTT overview . 29
4.2 URI and address assignments . 30
4.3 MCPTT speech . 31
4.4 Warning Header Field . 31
4.4.1 General . 31
4.4.2 Warning texts . 31
4.5 MCPTT session identity . 35
4.6 MCPTT priority calls and alerts . 35
4.6.1 MCPTT emergency group calls . 35
4.6.2 MCPTT emergency private calls . 37
4.6.3 MCPTT emergency alerts . 38
4.6.4 MCPTT imminent peril group call . 39
4.7 Communication security . 40
4.7.1 Media security . 40
4.7.2 Signalling security . 40
4.8 Protection of sensitive application data. . 42
4.9 Pre-established session . 45
4.10 MCPTT client ID . 46
4.11 Off-network MCPTT . 46
4.12 Broadcast Group Calls . 46
5 Functional entities . 46
5.1 Introduction . 46
5.2 MCPTT client . 46
5.3 MCPTT server . 48
5.3.1 General . 48
5.3.2 Functional connectivity models . 49
5.3.3 Failure case . 51
5.3.4 Management of MBMS bearers . 51
5.4 MCPTT UE-to-network relay. 51
6 Common procedures. 51
6.1 Introduction . 51
6.2 MCPTT client procedures . 51
6.2.0 Distinction of requests at the MCPTT client . 51
6.2.0.1 SIP MESSAGE request . 51
6.2.1 SDP offer generation . 52
6.2.2 SDP answer generation . 53
6.2.3 Commencement modes . 54
6.2.3.1 Automatic commencement mode . 54
6.2.3.1.1 Automatic commencement mode for private calls . 54
6.2.3.1.2 Automatic commencement mode for group calls . 54
6.2.3.2 Manual commencement mode . 54
6.2.3.2.1 Manual commencement mode for private calls . 54
ETSI

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3GPP TS 24.379 version 14.15.0 Release 14 4 ETSI TS 124 379 V14.15.0 (2022-07)
6.2.3.2.2 Manual commencement mode for group calls . 55
6.2.4 Leaving an MCPTT session initiated by MCPTT client . 55
6.2.4.1 On-demand session case . 55
6.2.4.2 Pre-established session case . 56
6.2.5 Releasing an MCPTT session initiated by MCPTT client . 56
6.2.5.1 On-demand session case . 56
6.2.5.2 Pre-established session case . 56
6.2.6 Receiving an MCPTT session release request . 57
6.2.7 Void . 57
6.2.8 Priority call conditions . 57
6.2.8.0 General . 57
6.2.8.1 MCPTT emergency group call conditions . 57
6.2.8.1.1 SIP INVITE request or SIP REFER request for originating MCPTT emergency group calls . 57
6.2.8.1.2 Resource-Priority header field for MCPTT emergency group calls . 58
6.2.8.1.3 SIP re-INVITE request for cancelling MCPTT in-progress emergency group state . 59
6.2.8.1.4 Receiving a SIP 2xx response to a SIP request for a priority call . 59
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 . 60
6.2.8.1.6 Determining authorisation for initiating or cancelling an MCPTT emergency alert . 60
6.2.8.1.7 Determining authorisation for cancelling the in-progress emergency state of an MCPTT

group . 61
6.2.8.1.8 Determining authorisation for originating a priority group call . 61
6.2.8.1.9 SIP request for originating MCPTT imminent peril group calls . 62
6.2.8.1.10 Determining authorisation for cancelling an imminent peril group call . 62
6.2.8.1.11 SIP re-INVITE request for cancelling MCPTT in-progress imminent peril group state . 63
6.2.8.1.12 Resource-Priority header field for MCPTT imminent peril group calls . 63
6.2.8.1.13 Receiving a SIP INFO request in the dialog of a SIP request for a priority group call . 63
6.2.8.1.14 SIP re-INVITE request for cancelling the in-progress emergency group state of a group by a
third-party . 64
6.2.8.1.15 Retrieving Resource-Priority header field values . 65
6.2.8.1.16 Handling receipt of a SIP re-INVITE request for priority group call origination status within
a pre-established session . 65
6.2.8.1.17 Priority group call conditions upon receiving call release . 66
6.2.8.1.18 Emergency private call conditions upon receiving call release . 66
6.2.8.2 Request for an originating broadcast group call . 67
6.2.8.3 MCPTT emergency private call conditions . 67
6.2.8.3.1 Authorisations . 67
6.2.8.3.1.1 Determining authorisation for initiating an MCPTT emergency private call . 67
6.2.8.3.1.2 Determining authorisation for cancelling an MCPTT emergency private call . 67
6.2.8.3.1.3 Determining authorisation for initiating or cancelling an MCPTT emergency alert to a
MCPTT user . 68
6.2.8.3.2 SIP request for originating MCPTT emergency private calls . 68
6.2.8.3.3 Resource-Priority header field for MCPTT emergency private calls . 68
6.2.8.3.4 Receiving a SIP 2xx response to a SIP request for an MCPTT emergency private call . 69
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. 69
6.2.8.3.6 SIP re-INVITE request for cancelling MCPTT emergency private call state. 69
6.2.8.3.7 Receiving a SIP INFO request in the dialog of a SIP request for a priority private call. 70
6.2.8.3.8 SIP re-INVITE request for cancelling the MCPTT emergency private call state by a third-
party . 71
6.2.8.3.9 Retrieving a KMS URI associated with an MCPTT ID . 71
6.2.9 Location information . 72
6.2.9.1 Location information for location reporting . 72
6.3 MCPTT server procedures . 73
6.3.1 Distinction of requests sent to the MCPTT server . 73
6.3.1.1 SIP INVITE request . 73
6.3.1.2 SIP REFER request . 74
6.3.1.3 SIP MESSAGE request . 74
6.3.1.4 SIP SUBSCRIBE request . 76
6.3.2 Participating MCPTT Function. 76
6.3.2.1 Requests initiated by the served MCPTT user . 76
6.3.2.1.1 SDP offer generation . 76
ETSI

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3GPP TS 24.379 version 14.15.0 Release 14 5 ETSI TS 124 379 V14.15.0 (2022-07)
6.3.2.1.1.1 On-demand session . 76
6.3.2.1.1.2 Pre-established session. 77
6.3.2.1.2 SDP answer generation . 77
6.3.2.1.2.1 On-demand session . 77
6.3.2.1.2.2 Pre-established session establishment . 77
6.3.2.1.3 Sending an INVITE request on receipt of an INVITE request . 78
6.3.2.1.4 Sending an INVITE request on receipt of a REFER request . 78
6.3.2.1.5 Response to an INVITE request . 79
6.3.2.1.5.1 Provisional responses . 79
6.3.2.1.5.2 Final response . 80
6.3.2.1.6 Sending a SIP BYE request on receipt of a SIP BYE request . 80
6.3.2.1.7 Sending a SIP BYE request on receipt of a SIP REFER request . 80
6.3.2.1.8 Priority call conditions . 81
6.3.2.1.8.0 General . 81
6.3.2.1.8.1 Determining authorisation for originating a priority group call . 81
6.3.2.1.8.2 Determining authorisation for initiating or cancelling an MCPTT emergency alert . 82
6.3.2.1.8.3 Validate priority request parameters . 83
6.3.2.1.8.4 Retrieving Resource-Priority header field values . 83
6.3.2.1.8.5 Generating a SIP re-INVITE request for priority group call origination within a pre-
established session . 83
6.3.2.1.8.6 Generating a SIP re-INVITE request for emergency private call origination within a pre-
established session . 84
6.3.2.1.8.7 Generating a SIP re-INVITE request for first-to-answer call origination within a pre-
established session . 85
6.3.2.1.9 Generating a SIP re-INVITE request on receipt of a SIP re-INVITE request . 85
6.3.2.1.10 Sending a SIP INVITE request on receipt of SIP 3xx response . 85
6.3.2.2 Requests terminated to the served MCPTT user . 86
6.3.2.2.1 SDP offer generation . 86
6.3.2.2.2 SDP answer generation . 86
6.3.2.2.2.1 On-demand session . 86
6.3.2.2.2.2 Pre-established session. 86
6.3.2.2.3 SIP INVITE request towards the terminating MCPTT client . 87
6.3.2.2.4 Response to a SIP INVITE request . 88
6.3.2.2.4.1 Provisional response . 88
6.3.2.2.4.2 Final response . 88
6.3.2.2.5 Automatic Commencement Mode . 88
6.3.2.2.5.1 General . 88
6.3.2.2.5.2 Automatic commencement for On-Demand session . 89
6.3.2.2.5.3 Automatic commencement for pre-established session . 90
6.3.2.2.6 Manual Commencement Mode . 91
6.3.2.2.6.1 General . 91
6.3.2.2.6.2 Manual commencement for On-Demand session . 92
6.3.2.2.6.3 Manual commencement for Pre-established session . 93
6.3.2.2.7 Void . 94
6.3.2.2.8 SIP BYE request towards the terminating MCPTT client . 94
6.3.2.2.8.1 On-demand.
...