Content for TS 24.379 Word version: 18.7.0
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6 Common procedures
6.1 Introduction
6.2 MCPTT client procedures
6.2.0 Distinction of requests at the MCPTT client
6.2.1 SDP offer generation
6.2.2 SDP answer generation
6.2.3 Commencement modes
6.2.4 Leaving an MCPTT session initiated by MCPTT client
6.2.5 Releasing an MCPTT session initiated by MCPTT client
6.2.6 Receiving an MCPTT session release request
6.2.8 Priority call conditions
6.2.9 Location information
6.2.10 Support for multiplexing
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6 Common procedures p. 66
6.1 Introduction p. 66
6.2 MCPTT client procedures p. 66
6.2.0 Distinction of requests at the MCPTT client p. 66
6.2.1 SDP offer generation p. 68
6.2.2 SDP answer generation p. 69
6.2.3 Commencement modes p. 70
6.2.3.1 Automatic commencement mode p. 70
6.2.3.1.1 Automatic commencement mode for private calls p. 70
6.2.3.1.2 Automatic commencement mode for group calls p. 71
6.2.3.2 Manual commencement mode p. 71
6.2.4 Leaving an MCPTT session initiated by MCPTT client p. 72
6.2.5 Releasing an MCPTT session initiated by MCPTT client p. 73
6.2.6 Receiving an MCPTT session release request p. 73
6.2.7 Void
6.2.8 Priority call conditions p. 74
6.2.8.0 General p. 74
6.2.8.1 MCPTT emergency group call conditions p. 74
6.2.8.1.1 SIP INVITE request or SIP REFER request for originating MCPTT emergency group calls p. 74
6.2.8.1.2 Resource-Priority header field for MCPTT emergency group calls p. 75
6.2.8.1.3 SIP re-INVITE request for cancelling MCPTT in-progress emergency group state p. 75
6.2.8.1.4 Receiving a SIP 2xx response to a SIP request for a priority call p. 76
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 p. 77
6.2.8.1.6 Determining authorisation for initiating or cancelling an MCPTT emergency alert p. 77
6.2.8.1.7 Determining authorisation for cancelling the in-progress emergency state of an MCPTT group p. 78
6.2.8.1.8 Determining authorisation for originating a priority group call p. 78
6.2.8.1.9 SIP request for originating MCPTT imminent peril group calls p. 78
6.2.8.1.10 Determining authorisation for cancelling an imminent peril group call p. 79
6.2.8.1.11 SIP re-INVITE request for cancelling MCPTT in-progress imminent peril group state p. 79
6.2.8.1.12 Resource-Priority header field for MCPTT imminent peril group calls p. 79
6.2.8.1.13 Receiving a SIP INFO request in the dialog of a SIP request for a priority group call p. 80
6.2.8.1.14 SIP re-INVITE request for cancelling the in-progress emergency group state of a group by a third-party p. 81
6.2.8.1.15 Retrieving Resource-Priority header field values p. 81
6.2.8.1.16 Handling receipt of a SIP re-INVITE request for priority group call origination status within a pre-established session p. 82
6.2.8.1.17 Priority group call conditions upon receiving call release p. 83
6.2.8.1.18 Emergency private call conditions upon receiving call release p. 83
6.2.8.1.19 Determining authorisation for initiating or cancelling an MCPTT adhoc group emergency alert p. 83
6.2.8.1.20 Determining authorisation for initiating or cancelling the in-progress emergency state of an MCPTT adhoc group p. 84
6.2.8.1.21 SIP INVITE request or SIP REFER request for originating MCPTT emergency adhoc group calls p. 84
6.2.8.1.22 Receiving a SIP 2xx response to a SIP request for a priority adhoc group call p. 84
6.2.8.1.23 Receiving a SIP 4xx response, SIP 5xx response or SIP 6xx response to a SIP request for a priority adhoc group call p. 85
6.2.8.1.24 Determining authorisation for originating a priority adhoc group call p. 85
6.2.8.1.25 SIP request for originating MCPTT imminent peril adhoc group calls p. 85
6.2.8.1.26 Handling receipt of a SIP re-INVITE request for priority adhoc group call origination status within a pre-established session p. 86
6.2.8.1.27 Priority adhoc group call conditions upon receiving call release p. 86
6.2.8.1.28 Determining authorisation for cancelling the in-progress imminent peril state of an MCPTT group p. 87
6.2.8.2 Request for an originating broadcast group call p. 87
6.2.8.3 MCPTT emergency private call conditions p. 87
6.2.8.3.1 Authorisations p. 87
6.2.8.3.1.1 Determining authorisation for initiating an MCPTT emergency private call p. 87
6.2.8.3.1.2 Determining authorisation for cancelling an MCPTT emergency private call p. 88
6.2.8.3.1.3 Determining authorisation for initiating or cancelling an MCPTT emergency alert to a MCPTT user p. 88
6.2.8.3.2 SIP request for originating MCPTT emergency private calls p. 88
6.2.8.3.3 Resource-Priority header field for MCPTT emergency private calls p. 89
6.2.8.3.4 Receiving a SIP 2xx response to a SIP request for an MCPTT emergency private call p. 89
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 p. 89
6.2.8.3.6 SIP re-INVITE request for cancelling MCPTT emergency private call state p. 90
6.2.8.3.7 Receiving a SIP INFO request in the dialog of a SIP request for a priority private call p. 91
6.2.8.3.8 SIP re-INVITE request for cancelling the MCPTT emergency private call state by a third-party p. 91
6.2.8.3.9 Retrieving a KMS URI associated with an MCPTT ID p. 92
6.2.9 Location information p. 92
6.2.10 Support for multiplexing p. 93
