i am also facing the same problem with the detaisl as follows
On out bound calls to PSTN, the modem hangs up after one or two rings
Inbound calls on PSTN Bridge not landing on AXON
below is the report:
22:44:02 Call 101 -> sip:95530@192.168.1.19
22:44:02 Incoming Call from: Carousel on Line: Carousel FXO Gateway
22:44:02 Dialing number: 5530
22:44:02 Incoming SIP call
22:44:14 Error returned: 480 Temporarily Unavailable
22:44:14 Call 101 -> sip:95530@192.168.1.19 disconnected
22:44:14 Call has disconnected