Thanks - Do you mind telling me the cli command to stop fail2ban? Yes on the firmware, good thought though. I have had issues in the past where the firmware was the issue
You are amazing DigitalDaz...I was struggling with this for 2 days until i get to this post..Thanks for all you do!!@Andrew Byrd, I don't want to be reading all that thread but on these ciscos in the advanced sip settings, set "insert via rport" and "handle via rport" to enabled, that should fix you up.
Also, while we are at it, on the same page look for the rtp packet size, on many ciscos they default to 30ms instead of 20ms.
That will almost certainly fix you up
View attachment 244