To resurrect an old discussion, I recently added a 4FXO card to a UC520. After restart I could configure the ports just fine, but for some reason the system will not use those ports for outbound calls. Incoming calls work fine and route as configured, but outgoing calls will not work.
The built-in FXO ports are in one trunk group (access code 9), the new FXO ports are in a different group (access code 7). I have two phones set to use trunk group 7 with priority 1, then failing over to group 9 with priority 7. On every outbound call from those phones there are several seconds of silence before the phones use trunk group 9 to place the call.
There is no audible dial tone when accessing trunk group 7, but there is audible dial tone when accessing trunk group 9.
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