As a fairly new 3CX installer I've found very little info on paging to be available. I'm in the process of replacing a decades old Executone phone system that uses external paging horns via a Bogen paging amp and also a Valcom VIP801 master and two Valcom 811 units. I can get the 3CX to access the Bogen and Valcom 801 using an unused FXO port of the Patton 4114, but, once accessed, the Yealink phone keypad will not send a DTMF tone needed to indicate the initiation of a page. Neither can I seem to get the multicast feature to interface with just the Valcom portion of the system. I find it hard to believe that someone, somewhere hasn't run across the same problem and found a workaround... If you're aware of the solution, I'm listing my email address and would sure welcome any and all constructive feedback! firstname.lastname@example.org Thanks!!