The audio packets must be going to another server. You'll need to route to that server through the voip wan.
Run a tcpdump on UDP packets coming from the phone. After dialing there will be a stream of UDP carrying the voice.
The audio packets must be going to another server. You'll need to route to that server through the voip wan.
Run a tcpdump on UDP packets coming from the phone. After dialing there will be a stream of UDP carrying the voice.