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  1. Simultaneous Calls - Can't hear a 2nd call coming in

    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...