We have a customer with about 14 remote phones on a pbxact 12.7.8-2203-2 appliance. Have a problem with one that was setup a month or so ago:
The last several days, every time I try to call out, the call would connect, but I could not hear anything. I discovered if I pressed the hold button twice, (on-off) I could hear, so I was doing that for every outgoing call, at the instant of connecting. Incoming calls were normal.
This location is double nat, the ISP can’t provide a public static ip.