I have installed FreePBX 188.8.131.52 with Asterisk 1.8. I had been running TrixBox and have used several external Polycoms with the system in the past without any issues.
I have correctly configured port forwarding on the Firewall and to do some even more extensive testing, I have a Polycom IP 670 outside of the firewall on an IP and have allowed all traffic between that IP and the external IP of the VoIP Server.
The VoIP Server can reach the Internet and all communication seems to work between the VoIP Server and the Polycom. I can format the file system on the Polycom and the Polycom will register with the VoIP server and download the BootROM and Application just fine.
The phone also shows as registered with the configured extension.
I can make a call from the Polycom to my cell phone and hear Bi-Directional Communication.
However, when I use my cell phone to call the Polycom, I get a fast Busy and this appears in the logs of the FreePBX Server:
[2013-04-10 12:21:10] WARNING: app_dial.c:2345 dial_exec_full: Unable to create channel of type ‘SIP’ (cause 20 - Subscriber absent)
All Internal Calls work between Polycom phones.
I have shut down iptables and disabled Intrusion Detection.
All Outbound and Inbound calls work on all Polycoms inside the system.
The reg.cfg for the phone contains (along with the other standard config:
reg.1.outboundProxy.address="<EXTERNAL VOIP IP>" reg.1.outboundProxy.port="5060" reg.1.outboundProxy.transport="UDPOnly" reg.1.ringType="2" reg.1.lineKeys="1"/> <call>
I am very confused at this point and cannot find any relevant information specific to this problem. Everything I find relates to problems with the setup that I have setup correctly.
Any insight or help would be appreciated.