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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
6.3.2.1   Requests initiated by the served MCPTT user
6.3.2.1.1   SDP offer generation
6.3.2.1.2   SDP answer generation
6.3.2.1.3   Sending an INVITE request on receipt of an INVITE request
6.3.2.1.4   Sending an INVITE request on receipt of a REFER request
6.3.2.1.5   Response to an INVITE request   PDF-p. 77
6.3.2.1.6   Sending a SIP BYE request on receipt of a SIP BYE request
6.3.2.1.7   Sending a SIP BYE request on receipt of a SIP REFER request   PDF-p. 78
6.3.2.1.8   Priority call conditions   PDF-p. 79
6.3.2.1.9   Generating a SIP re-INVITE request on receipt of a SIP re-INVITE request   PDF-p. 82
6.3.2.1.10   Sending a SIP INVITE request on receipt of SIP 3xx response
6.3.2.2   Requests terminated to the served MCPTT user   PDF-p. 83
6.3.2.3   Processing I_MESSAGEs containing MKFC and MKFC-ID   PDF-p. 93
6.3.3   Controlling MCPTT function   PDF-p. 94
6.3.3.1   Request initiated by the controlling MCPTT function
6.3.3.1.1   SDP offer generation
6.3.3.1.2   Sending an INVITE request
6.3.3.1.3   Receipt of a SIP response to a SIP INVITE request   PDF-p. 95
6.3.3.1.4   Void
6.3.3.1.5   Sending a SIP BYE request
6.3.3.1.6   Sending a SIP re-INVITE request for MCPTT emergency group call
6.3.3.1.7   Sending a SIP INVITE request for MCPTT emergency group call   PDF-p. 96
6.3.3.1.8   Sending a SIP UPDATE request for Resource-Priority header field correction   PDF-p. 97
6.3.3.1.9   Generating a SIP re-INVITE request   PDF-p. 98
6.3.3.1.10   Generating a SIP re-INVITE request to cancel an in-progress emergency
6.3.3.1.11   Generating a SIP MESSAGE request for notification of in-progress emergency or imminent peril status change   PDF-p. 99
6.3.3.1.12   Populate mcptt-info and location-info MIME bodies for emergency alert
6.3.3.1.13   Authorisations   PDF-p. 100
6.3.3.1.14   Generating a SIP 403 response for priority call request rejection   PDF-p. 105
6.3.3.1.15   Sending a SIP re-INVITE request for MCPTT imminent peril group call
6.3.3.1.16   Handling the expiry of timer TNG2 (in-progress emergency group call timer)   PDF-p. 106
6.3.3.1.17   Validate priority request parameters      Up
6.3.3.1.18   Sending a SIP INFO request in the dialog of a SIP request for a priority call   PDF-p. 107
6.3.3.1.19   Retrieving Resource-Priority header field values
6.3.3.1.20   Generating a SIP MESSAGE request to indicate successful receipt of an emergency alert or emergency cancellation   PDF-p. 108
6.3.3.2   Requests terminated by the controlling MCPTT function
6.3.3.3   Handling of the acknowledged call setup timer (TNG1)
6.3.3.4   Generating a SIP NOTIFY request   PDF-p. 112
6.3.3.5   Handling of the group call timer (TNG3)   PDF-p. 113
6.3.3.6   Generation of I_MESSAGEs containing MKFC and MKFC-ID
6.3.4   Non-controlling MCPTT function of an MCPTT group   PDF-p. 115
6.3.5   Retrieving and processing a group document
6.3.6   Affiliation check      Up
6.3.7   Error handling   PDF-p. 126
6.3.8   Session release policy

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