Content for TS 24.379 Word version: 18.7.0
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6.3 MCPTT server procedures
6.3.1 Distinction of requests sent to the MCPTT server
6.3.2 Participating MCPTT Function
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6.3 MCPTT server procedures p. 94
6.3.1 Distinction of requests sent to the MCPTT server p. 94
6.3.1.1 SIP INVITE request p. 94
6.3.1.2 SIP REFER request p. 94
6.3.1.3 SIP MESSAGE request p. 95
6.3.1.4 SIP SUBSCRIBE request p. 101
6.3.2 Participating MCPTT Function p. 102
6.3.2.1 Requests initiated by the served MCPTT user p. 102
6.3.2.1.1 SDP offer generation p. 102
6.3.2.1.2 SDP answer generation p. 103
6.3.2.1.3 Sending an INVITE request on receipt of an INVITE request p. 104
6.3.2.1.4 Sending an INVITE request on receipt of a REFER request p. 104
6.3.2.1.5 Response to an INVITE request p. 106
6.3.2.1.5.1 Provisional responses p. 106
6.3.2.1.5.2 Final response p. 106
6.3.2.1.6 Sending a SIP BYE request on receipt of a SIP BYE request p. 107
6.3.2.1.7 Sending a SIP BYE request on receipt of a SIP REFER request p. 107
6.3.2.1.8 Priority call conditions p. 108
6.3.2.1.8.0 General p. 108
6.3.2.1.8.1 Determining authorisation for originating a priority group call p. 108
6.3.2.1.8.2 Determining authorisation for initiating or cancelling an MCPTT emergency alert p. 109
6.3.2.1.8.3 Validate priority request parameters p. 109
6.3.2.1.8.4 Retrieving Resource-Priority header field values p. 109
6.3.2.1.8.5 Generating a SIP re-INVITE request for priority group call origination within a pre-established session p. 110
6.3.2.1.8.6 Generating a SIP re-INVITE request for emergency private call origination within a pre-established session p. 111
6.3.2.1.8.7 Generating a SIP re-INVITE request for first-to-answer call origination within a pre-established session p. 111
6.3.2.1.8.8 Determining authorisation for originating a priority adhoc group call p. 112
6.3.2.1.8.9 Validate adhoc group priority request parameters p. 112
6.3.2.1.8.10 Generating a SIP re-INVITE request for priority adhoc group call origination within a pre-established session p. 112
6.3.2.1.9 Generating a SIP re-INVITE request on receipt of a SIP re-INVITE request p. 113
6.3.2.1.10 Sending a SIP INVITE request towards the non-controlling MCPTT function p. 113
6.3.2.2 Requests terminated to the served MCPTT user p. 114
6.3.2.2.1 SDP offer generation p. 114
6.3.2.2.2 SDP answer generation p. 114
6.3.2.2.3 SIP INVITE request towards the terminating MCPTT client p. 115
6.3.2.2.4 Response to a SIP INVITE request p. 115
6.3.2.2.4.1 Provisional response p. 115
6.3.2.2.4.2 Final response p. 116
6.3.2.2.5 Automatic Commencement Mode p. 116
6.3.2.2.5.1 General p. 116
6.3.2.2.5.2 Automatic commencement for On-Demand session p. 116
6.3.2.2.5.3 Automatic commencement for pre-established session p. 118
6.3.2.2.6 Manual Commencement Mode p. 119
6.3.2.2.6.1 General p. 119
6.3.2.2.6.2 Manual commencement for On-Demand session p. 119
6.3.2.2.6.3 Manual commencement for Pre-established session p. 121
6.3.2.2.7 Void
6.3.2.2.8 SIP BYE request towards the terminating MCPTT client p. 122
6.3.2.2.9 Populate MIME bodies p. 123
6.3.2.2.10 Generating a SIP re-INVITE request towards the terminating MCPTT client p. 123
6.3.2.2.11 Generating a SIP MESSAGE request towards the terminating MCPTT client p. 123
6.3.2.3 Void
6.3.2.4 Request initiated by the participating MCPTT function p. 124
6.3.2.4.1 Generating a SIP MESSAGE request for notification of entry into or exit from an emergency alert area p. 124
6.3.2.4.2 Generating a SIP MESSAGE request for notification of entry into or exit from a group geographic area p. 125
6.3.2.5 Handling of the no answer timer (TNP1) p. 126
6.3.2.6 Generating a SIP MESSAGE request for call forwarding of a private call p. 126
