My extension has several desk/soft phones connected. When I answer a incoming call on a desk phone it never hangs up if the remote party ends the call. No other user on the system has multiple phones so no one else has reported this issue. The system is a new install of 4.4.
both desk phone do it, 1 is a grandstream the other is a yealink.
both desk phone do it, 1 is a grandstream the other is a yealink.