====== onIncomingGroupCall() ======
wrtc.onIncomingGroupCall() is an event function called when during group call mesh setup another member of the group calls you.

Usually you do not need to do anything, wrtc_kit will answer the call automatically, but you can use this event to [[ixnx:wrtc:js:api:wrtc:adv.autogroup|stop the call]] if eg the person calling you is on blacklist.

===== Arguments =====
wrtc.onIncomingGroupCall(obj)
  * obj - call object that raised the event

===== Return value =====
Ignored.