wrtc.inviteGroup() is used to start group calls.
To start a group call with calls a, b and c call wrtc.invitegroup([call_a, call_b, call_c])
To later on add call d to the group call call wrtc.invitegroup([call_a, call_b, call_c, call_d]). The old participants in the group call must be included into the new call.
To start a group call involving all current calls call wrtc.invitegroup() without any arguments. This method can also be used to add new calls to the group.
wrtc.inviteGroup(list)
To invite all current calls into a group call call wrtc.inviteGroup() without arguments.
Nothing.