I need a little assistance with a site-to-site VPN setup. We did not originally setup the UCM PBX and phone systems are a bit foreign to us.
Here’s the scenario,
The client has their main site with phones and the PBX. All works well there. They also have a remote site connected via a Sonicwall SOHO 250 with a site-to-site VPN. All traffic across the VPN is allowed.
With this setup alone, phones at the remote location would register successfully using the PBX private IP. Calls could be made internally and externally with a problem - internal calls were 1-way audio (the phone at the remote location could not be heard, but the extension at the main office could be heard), external calls had no audio in either direction.
When I did a packet capture, the phones would initially connect to the PBX using the private IP, but then change to the public IP. Also note - no outbound ringing sound could be heard on the remote phones. I was able to get the system fully functional by forwarding ports 5060-5061 to the PBX at the main location. However, that seems to defeat the purpose of the VPN.
Any assistance in getting this to work without port forwarding from the public IP is appreciated!