The following subclauses define information flows and signaling procedures for group calls and broadcast group calls.
Where the group is defined in the MCPTT system and where the IWF has affiliated to an MCPTT group with a single affiliation on behalf of all LMR group members, only a single IWF group call request / IWF group call release request message is sent to the IWF at the commencement / release of a group call. Where the group is defined in the MCPTT system and where the IWF has passed through individual affiliations for each group member in the LMR system, the MCPTT system shall send individual IWF group call request / IWF group call release request messages to the IWF for all affiliated group members in the LMR system in accordance with primary and partner MCPTT system behaviour. In both cases, the distribution of the messages to group members in the LMR system is out of scope of the present document.
Where the group is defined in the LMR system, the IWF shall send individual IWF group call request / IWF group call release request messages to the IWF for all affiliated MCPTT group members in accordance with primary and partner MCPTT system behaviour.
The following subclauses define information flows for group calls on the IWF-1 interface. Group call related information flows on reference points other than IWF-1 are defined in TS 23.379.
Table 10.3.2.4-1 describes the information flow IWF group-broadcast group call setup request from the MCPTT server to the IWF and from the IWF to the MCPTT server.
Table 10.3.2.5-1 describes the information flow IWF group-broadcast group call setup response from the IWF to the MCPTT server and from the MCPTT server to the IWF.
Table 10.3.2.6-1 describes the information flow IWF group-broadcast group call release request from the MCPTT server to the IWF and from the IWF to the MCPTT server.
Table 10.3.2.7-1 describes the information flow IWF group-broadcast group call release request from the IWF to the MCPTT server and from the MCPTT server to the IWF.
Table 10.3.2.13-1 describes the information flow IWF group call release response from the IWF to the MCPTT server and from the MCPTT server to the IWF.
Table 10.3.2.14-1 describes the information flow IWF pre-configured regroup request from the IWF to the MCPTT server and from the MCPTT server to the IWF.
Table 10.3.2.15-1 describes the information flow IWF pre-configured regroup response from IWF to the MCPTT server and from the MCPTT server to the IWF.
Table 10.3.2.16-1 describes the information flow pre-configured regroup cancel request from the IWF to the MCPTT server and from the MCPTT server to the IWF.
Table 10.3.2.17-1 describes the information flow IWF pre-configured regroup cancel response from the IWF to the MCPTT server and from the MCPTT server to the IWF.
Table 10.3.2.18-1 describes the information flow IWF pre-configured regroup reject from the IWF to the MCPTT server and from the MCPTT server to the IWF.