13.20.1 Beginning the Voice group call

23.2053GPPBearer-independent circuit-switched core networkRelease 17Stage 2TS

The procedures specified in 3GPP TS 43.068 [39] and 3GPP TS 48.008 [27] (for AoIP) for the Voice group call service shall be followed. For a Voice broadcast call the procedures in 3GPP TS 43.069 [40] and 3GPP TS 48.008 [27] (for AoIP) shall be followed. When the served mobile subscriber invokes a Voice group call service the MSC server selects an MGW that provides the conference bridge capabilities with enhancements to support Voice group calls. The MSC server shall estimate the size of the Conference terminations needed for the VGCS call from the data retrieved from GCR and reserves the requested number of Conference terminations for that call. The number of needed conference terminations is provided within the prepare bearer procedure.