My configuration is Cisco 7961 <--> Asterisk <--> 2811 <--> Level3 (using SIP all the way).
My main issue is that when I specify NAT=no and Public IP in the Asterisk SIP Settings on FreePBX, the calls complete fine except that the internal IP address is visible in the FROM: tag. If I change to NAT=yes and Static IP in the settings, then the FROM: in the INVITE is formatted correctly but there is no audio and the call will automatically drop about 10sec after connection.
The additional problem is that internal calls, which shouldn't even touch the 2811, follow the same no audio behavior.
I have googled and searched so much that I am completely confused and am not sure if the issue is in the Asterisk, 2811, or both. I can provide any config info requested.
2811 - Version 12.4(15)T12
Asterisk - 1.8.11
freePBX - 18.104.22.168
Thank you for any guidance and help in advance,