True. I’ll just point out that with a VPN, IF he’s getting DNS from the office, and it’s overriding his external IP for the server with an internal address, as he mentioned early in this thread, there could be a routing problem that is causing this. But I’m not real familiar with rport, so you’re probably right
@DigitalDaz. One way to test might be to check DNS resolution for the SIP server domain from the home network. If it’s resolving to the external IP, then I’m not sure what the problem might be.