IP Trunk Loss

[pakman]

Hello,

Had a situation in where 15 or so phones at site A reported phone interruptions some lost the call all together and some reported that the call didn't fall off but they couldn't hear each other any more. After looking at the logs they show a lot of  IP trunk to 10.x.x.x:1815 has failed. I brought in our Mitel service provider and he said it's a network related issue. I have since combed through the LEM and other logs and found zero logs that would of caused a network issue during this time. Is there anything else on the PBX i can look into?

Thanks,

[ralph]

In my opinion it is going to be a network issue.
But this may depend on the far end point the phones were talking to.
If the calls were phone to phone or SIP Trunk call then I'd be really confident that it was a network issue.
If the calls were going out TDM trunks then it could be the controller.
Take a piece of paper and draw a diagram of how those calls were working. 
Remember that when the call is up the IP packets do not go through the controller unless it's using TDM trunks on that controller.

Ralph

[pakman]

Thanks Ralph.

I don't know how many were IP to IP but the folks that it most heavily affected where the call center and most of those would of been callers coming in on the PRI so the controller would have come into play. correct?

[acejavelin]

True, all PRI calls come through the controller in most cases... but loss of audio is almost always a network issue.

[VinceWhirlwind]

"IP trunk to 10.x.x.x:1815 has failed"
 
What is this IP trunk?
When I see this, it means a WAN link has gone down and two controllers can no longer see each other over it. When that happens, all audio flowing over that WAN link is obviously interrupted.
Your network infrastructure should also have logged the outage.