Intermittent Failure of Outgoing SIP Calls
M270 Firebox, 12.5.4 fw
I'm wondering if anyone can shed any light on an issue I am having.
I am reconfiguring my Avaya PBX to use SIP for external calls, so far, incoming calls appear to be working without a problem but I am seeing an intermittent issue with external calls.
When calling a mobile, 99% of the time the call completes as expected. When calling a landlane, 99% of the time I have no ringing and no voice when the call connects however the recipient of the call can hear me fine.
I have used traffic monitor and I can see the call connection packets, in the instances when I get no audio, nothing in the logs indicate an issue or data being being blocked.
I have an open support case but I thought I would also ask here incase anyone has experienced a similar issue and managed to resolve it.