Hi all, I am wondering if I can get some guidance please. Our 3CX system (version 15) has a SIP trunk coming through a Patton to a Windows server. The users have reported that they don't hear a call when the 1st line is in use, therefore do not know that the phone is ringing. The SIP trunk has been configured with 2 simultaneous calls. Do I need to enable this anything? Any articles would be helpful too. I'm not massively clued up with 3CX, so any help would be appreciated.