I just set up a new Elastix 2.0.3 server and have a problem with 1 remote extension. The extension, an Aastra 51i can call out, but incoming calls rings at the phone, but you can't answer them. I have set my remote nat settings in the Unembedded FreePBX->Tools->Asterisk SIP Settings. my firewall has ports 443/TCP, 5060-5061/UDP, 10000-20000/UDP forwarded to the server. I have tried softphones at other remote locations and have some Aastra 480i phone remote that work. I am at a loss.