Content for TS 29.379 Word version: 17.5.0
4 General p. 13
4.1 IWF overview p. 13
4.2 Warning Header Field p. 13
4.2.1 General p. 13
4.2.2 Warning texts p. 13
4.3 MCPTT priority calls and alerts p. 14
4.4 Media security at the IWF p. 14
4.5 Broadcast group calls p. 14
5 Functional entities p. 14
5.1 General p. 14
5.2 Functional connectivity models p. 15
6 Call control common procedures p. 17
6.1 SDP p. 17
6.2 Commencement modes p. 18
6.2.1 Automatic commencement mode for private calls p. 18
6.2.2 Manual commencement mode for private calls p. 19
6.3 Receiving an MCPTT session release request p. 19
6.4 Priority call conditions p. 19
6.4.1 MCPTT emergency group call conditions p. 19
6.4.1.1 SIP INVITE request for originating MCPTT emergency group calls p. 19
6.4.1.2 Resource-Priority header field for MCPTT emergency group calls p. 20
6.4.1.3 SIP re-INVITE request for cancelling MCPTT in-progress emergency group state p. 21
6.4.1.4 Receiving a SIP 2xx response to a SIP request for a priority call p. 21
6.4.1.5 Receiving a SIP 4xx response, SIP 5xx response or SIP 6xx response to a SIP request for a priority group call p. 22
6.4.1.6 SIP request for originating MCPTT imminent peril group calls p. 22
6.4.1.7 SIP re-INVITE request for cancelling MCPTT in-progress imminent peril group state p. 23
6.4.1.8 Resource-Priority header field for MCPTT imminent peril group calls p. 23
6.4.1.9 Receiving a SIP INFO request in the dialog of a SIP request for a priority group call p. 23
6.4.1.10 SIP re-INVITE request for cancelling the in-progress emergency group state of a group by a third-party p. 24
6.4.1.11 Resource-Priority header field values p. 25
6.4.2 MCPTT emergency private call conditions p. 25
6.5 Location information p. 26
6.6 IWF server role procedures p. 27
6.6.1 Distinction of requests sent to the IWF p. 27
6.6.1.1 SIP INVITE request p. 27
6.6.1.2 SIP MESSAGE request p. 27
6.6.1.3 SIP SUBSCRIBE request |R17| p. 28
6.6.2 IWF participating role p. 28
6.6.2.1 Requests initiated by a participant homed in the IWF p. 28
6.6.2.1.1 SDP offer generation p. 28
6.6.2.1.2 Sending an INVITE request p. 29
6.6.2.1.3 IWF sending a SIP BYE request p. 30
6.6.2.1.4 Priority call conditions p. 30
6.6.2.1.4.1 General p. 30
6.6.2.1.4.2 Determining authorisation for originating a priority group call p. 30
6.6.2.1.4.3 Determining authorisation for initiating or cancelling an MCPTT emergency alert p. 30
6.6.2.1.4.4 Validate priority request parameters p. 31
6.6.2.1.4.5 Retrieving Resource-Priority header field values p. 31
6.6.2.1.5 Sending a SIP INVITE request on receipt of SIP 3xx response p. 31
6.6.2.2 Requests terminated to the IWF p. 32
6.6.3 IWF controlling role p. 32
6.6.3.1 Requests initiated by the IWF performing the controlling role p. 32
6.6.3.1.1 Sending an INVITE request p. 32
6.6.3.1.2 Sending a SIP BYE request p. 33
6.6.3.1.3 Sending a SIP re-INVITE request for MCPTT emergency group call p. 33
6.6.3.1.4 Sending a SIP INVITE request for MCPTT emergency group call p. 34
6.6.3.1.5 Sending a SIP UPDATE request for Resource-Priority header field correction p. 35
6.6.3.1.6 Generating a SIP re-INVITE request to cancel an in-progress emergency p. 36
6.6.3.1.7 Populate mcptt-info and location-info MIME bodies for emergency alert p. 36
6.6.3.1.8 Authorisations p. 37
6.6.3.1.8.1 Determining authorisation for initiating an MCPTT emergency alert p. 37
6.6.3.1.8.2 Determining authorisation for initiating an MCPTT emergency group or private call p. 37
6.6.3.1.8.3 Determining authorisation for cancelling an MCPTT emergency alert p. 37
6.6.3.1.8.4 Determining authorisation for cancelling an MCPTT emergency group or private call p. 38
6.6.3.1.8.5 Determining authorisation for initiating an MCPTT imminent peril call p. 38
6.6.3.1.8.6 Determining authorisation for cancelling an MCPTT imminent peril call p. 38
6.6.3.1.8.7 Sending a SIP OPTIONS request to authorise an MCPTT user at a non-controlling MCPTT function of a MCPTT group p. 38
6.6.3.1.9 Generating a SIP 403 response for priority call request rejection p. 40
6.6.3.1.10 Handling the expiry of timer TNG2 (in-progress emergency group call timer) p. 40
6.6.3.1.11 Sending a SIP INFO request in the dialog of a SIP request for a priority call p. 41
6.6.3.1.12 Retrieving Resource-Priority header field values p. 41
6.6.3.2 Requests terminated by the IWF performing the controlling role p. 41
6.6.3.3 Handling of the acknowledged call setup timer (TNG1) p. 42
6.6.3.4 Generating a SIP NOTIFY request p. 44
6.6.3.5 Handling of the group call timer (TNG3) p. 45
6.6.4 IWF non-controlling role p. 46
6.6.4.1 Request initiated by the IWF performing the non-controlling role of a group p. 46
6.6.4.1.1 SDP offer generation p. 46
6.6.4.1.2 Sending an INVITE request towards the MCPTT client p. 46
6.6.4.1.3 Sending a SIP INFO request p. 47
6.6.4.1.4 Sending an INVITE request towards the controlling MCPTT function p. 48
6.6.4.2 Requests terminated by the non-controlling MCPTT function of an MCPTT group p. 49
6.6.4.2.1 SDP answer generation p. 49
6.6.4.2.2 Sending a SIP response to the SIP INVITE request p. 49
6.6.4.3 Generating a SIP NOTIFY request p. 50
6.6.5 Retrieving and processing a group document p. 51
6.6.5.1 General p. 51
6.6.5.2 Rules for joining a group session p. 51
6.6.5.3 Determining the group members to invite p. 51
6.6.6 Error handling p. 51
6.6.7 Session release policy p. 51
6.7 Implicit floor request p. 52
6.8 Confidentiality and Integrity Protection p. 52
6.8.1 General p. 52
6.8.1.1 Applicability and exclusions p. 52
6.8.1.2 Performing XML content encryption p. 52
6.8.1.3 Performing integrity protection on an XML body p. 52
6.8.1.4 Keys used in confidentiality protection procedures p. 53
6.8.2 Confidentiality Protection p. 53
6.8.2.1 Procedures for sending confidentiality protected content p. 53
6.8.2.2 IWF copying received XML content p. 53
6.8.3 Integrity Protection of XML documents p. 54
6.9 Priority sharing p. 54
6.10 Void
