The present document specifies the group management protocols needed to support Mission Critical Push To Talk
(MCPTT). Group management applies only when the UE operates on the network.
The present document is applicable to User Equipment (UE) supporting the group management client (GMC)
functionality, to application server supporting the group management server (GMS) functionality, and to application
server supporting the MCPTT server functionality.
for V14, V15:
(B) Signalling security alignment
| (F) Off-network MCVideo configurations
(B) Response-Source header field handling completion