====== onHungUp() ======
wrtc.onHungUp() is an event function called when when local user ends a call, "hungs up phone".

(If call is ended by other end hanging up [[ixnx:wrtc:js:api:wrtc:ongothungup|wrtc.onGotHungUp]] occurs instead.)

You can use this event to indicate call has ended.

===== Occurs =====
Local user ended call using [[ixnx:wrtc:js:api:call:hangup|call.hangup()]]

===== Arguments =====
wrtc.onHungUp(obj)
  * obj - call object raising the event

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