Running 3cx version 15.5.0 Standard Desktop phone is Yealink SIP T22p Issue: Recently upgraded to 15.5.0 and new phones. Prior to the upgrade the outlook plugin worked fine. I could select contact in outlook, select 3cx tab, and click telephone number within outlook to dial the contact on my desk phone. After the 3cx upgrade and new phone this same functionality works until something unknown goes wrong. When I click dial within outlook nothing happens at the desktop phone. The softphone (computer phone) shows some activity (see attached picture). After the problem arises if I unplug the power to the desk phone and plug back in (power reset) the problem goes away and the outlook functionality works again. Then some unknown issues cause it to stop working again. After something goes wrong and I receive an incoming call the outlook contact pops up so at least part of the outlook plug in works.