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IVR LOW CPU Resource calls rejected

Hi,

Have a 3825 router acting as CUBE (SIP) with our provider. All this router does is act as a CUBE (no routing) and does some MTP and transcoding (very little, not very often). I'm seeing high CPU once a day or maybe once every 2 days at random times and it rejects calls per logs (I haven't heard of any complaints, and I haven't been able to catch it to see if call comes in our other CUBE when it is rejected on first one due to cpu).

Nov  7 2011 13:27:25.310 CST: %IVR-3-LOW_CPU_RESOURCE: IVR: System experiencing high cpu utilization (96/100).

     Call (callID=599411) is rejected.

Nov  7 2011 13:27:25.338 CST: %IVR-3-LOW_CPU_RESOURCE: IVR: System experiencing high cpu utilization (96/100).

     Call (callID=599412) is rejected.

This is a 3825 router runnig IOS 12.4(24)T6, and doesn't have much else confgured besides a static default route and dial-peers and related voip/SIP setup. This CPU spike also happens at night (8-9pm) when there are maybe 2-3 calls on the router and I don't see CPU pegged during day when there are several more active calls.

Is therre a way to adjust this call rejection behavior? I've looked on cisco.com and can't find anything on this really.

Thanks,

Erick

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