Unsure where to begin tracing this down. Have a FreePBX instance running and using a SIP trunk and DID from Twilio as a provider for inbound and outbound trunks. All works except 1 thing…
If I initiate an outbound call from FreePBX using the Twilio trunk, and I call my cellphone the caller ID on my cellphone shows up as +1 XXX-XXX-XXXX
If I then go to my call history on my phone and try to call the number back, it rings once or a half ring and then disconnects the call immediately. If I remove the +1 and just dial XXX-XXX-XXXX the call completes as expected. It gets routed to FreePBX and the call is connected.
I am not sure if the reason I cannot get +1 XXX-XXX-XXXX to work from my cell is related to my cell phone, the Twilio trunk, a setting within FreePBX or what. Also not sure what log I could look at within FreePBX to determine if the attempt to +1 XXX-XXX-XXXX is even being reached.