09-18-2012 04:20 AM
Over three hours on the phone to PA support this morning got it sorted.
My applictation override rules were not working, as they were pointing at predefined applications. Custom Apps for both SIP and RTP were created which then started to allow some RTP through.
We were still getting quite a few calls with no audio (some were coming through). The PA engineer discovered that this was due to us using the dynamic-ip-and-port option in our outgoing source translation. Changing this to static-ip fixed it.
Here's what my working setup looks like;
Application Override Rules;
Custom SIP Application;
Custom RTP/RTCP Application;
Hope this helps anybody experiencing similar problems. PA have taken a support dump, so may have a more elegant fix at some point.