Good morning, 3cx phone system of my small business have 4 extension. Each extension is registered to the PBX with IP phone (Grandstream gxp1620) and with 3CXPhone in CTI client mode. I noticed that interior presence is also signaled with the PC off (and therefore with 3CXPhone off), so I assumed that PBX detects the connected IP phone. It's possible to set presence with single connection 3CXPhone software? I hope that I have well explained you the problem, Thank you in advance and forgive me for my bad english!!