I have a UCM 6104 for quite some time and when I bought and set it up, everything was working great, however, after a firmware upgrade (I don’t remember the firmware number) the external extensions stoped working. Basically Whenever I made a call from an external extention the calls were muted in both ends, calling from one extension another, or calling external numbers using the my SIP provider. I changed all external extensions to TLS but due to some company policy changes I will have to leave external extensions connect through UDP only.
These are the ports forwarded to UCM
All internal extensions are working fine. But whenever I dial from a external extension the call stay muted in both ends.
When I remove my external IP from PBX Setttings< SIP Settings < NAT < External Host the extensions work normally for about 32 seconds and them the call drops, when I add my external IP Address to the option mentioned I face the muted call problem. However when the call is muted but the external IP address is configured, the call doesn’t drop after the 32 seconds…
I wanted to reset the UCM and start from scratch but right now this is not an option. Any ideas of what is causing this issue?
I’ve read in some threads that some people had issues when the Use IP address in SDP check box was checked, I tried on and off with external ip and no external IP and nothing…
this is my UCM INFO
Thank you in advance.