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Question: denial event 1220: Recovery on timer expiry

J1121 (MIS) (OP)
20 Aug 12 8:06
We have many sites that have Avaya media gateways linked to the core server over the WAN and they use Microsoft Unified Messaging for voice mail. They all work great except for one. Here's the call flow: Incoming call from ISDN PRI trunk at Avaya media gateway > cover to unified messaging via Avaya Communication Manager > Avaya Session Manager > Microsoft Exchange Unified Messaging server.

Here's what is happening. Sporadically, callers will get cut off when leaving a message after the call has been active for about 20 seconds or so. I thought it had something to do with a timer timing out because the cut off messages were always only about 4 or 5 seconds. So that along with the time it took for the person's greeting to play took about 18 seconds or so. I finally found a time when it was happening and did a list trace on the calls I was making to test. I noticed the denial event 1220: Recovery on timer expiry D1=0x86a4 D2=0x66 message when the problem occurred. So now I know what is happening, but I can't yet figure out which leg of the call is responsible for the problem. Any ideas?
J1121 (MIS) (OP)
20 Aug 12 8:12
By the way, I've verified the amount of bandwidth we have from the provider that we can put QOS on and verified that we have the PBX set the same way, so none of the traffic should be dropped between the Avaya media gateway and the main site where the Avaya core server, session manager and MS UM is. I thought that could possibly be an issue, but it looks ok. I don't think any other data traffic is causing any of the voice signalling or actual voice traffic to be dropped.

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