I have my 3CX server running on internal IP 192.168.22.3. I use DynDNS.org to register my external IP address (myaddress.dyndns.org). I have two extensions: - 10: a local Cisco IP phone - 20: a soft IP phone I can succesfully register the soft IP phone when I'm away from home using myaddress.dyndns.org as the proxy. But when I try to make an outbound call, it always fails. A peek in the server log shows that when I make a call from extension 10 to e.g. number 123-456-7890, it shows: Incoming call from Ext. 10 to <sip:firstname.lastname@example.org> But when I make that call from the soft IP phone, it shows: Incoming call from Ext. 20 to <sip:email@example.com> I think perhaps that this is making it skip the outbound rules, and the call fails? Any ideas how I should configure the use of a soft IP phone extension when I'm away from my home office? Thx!