We're on 5.0 SP2 PR2. The CCM is 7.0 (Cisco Call Manager).
I have a SIP trunk established between a centralized 3300 and the CCM Publisher. All other 3300's are sending the digits via ARS digits dialed to the centralized 3300 and then out the SIP trunk to the CCM.
When it was established, we tested and everything was great. I call them, they call us, we both heard each other. Lately (as in 3 days later) after a while no audio was passing. I call over there, nothing. They call here, nothing. Forward calls to voicemail and still same problem. No message is left on their side and they don't hear our voicemail system.
Kinda at a loss as to what broke. There have been no chances to the SIP trunk or the centralized controller on the 3300 side. I saw the blurbs about SDP dupliacte offers, made the mods and still no audio. Session timer is set to Zero (disabled). I had it at 90 when it was working. I bumped it up to 1800 per an older Cisco <> Mitel document I found to no avail. I'm at a loss as to what happened. Any insight?
I heard rumors there's an updated MOL document that outlines how to configure a SIP trunk from a 3300 to CCM. I found a Cisco document that I followed that didn't really match up to what we have (it was on the old 7.1 release).