Cisco Bug: CSCtd42708 - high CPU in SIP pointing to 491/ack loop
Jul 07, 2017
- Cisco Unified Communications Manager (CallManager)
Known Affected Releases
Symptom: Cisco IOS VoIP gateway configured for IPIPGW/CUBE may experience issues of high CPU utilization. Conditions: Under rare conditions the Cisco IOS gateway may get into a state where the processes associated with SIP (as seen in <CmdBold>show process cpu<noCmdBold>) may get into a state where they are running extremely high causing further calls through the router to fail. This is due to the gateway and 3rd party device in a SIP '491 Requent Pending' and ACK loop. THis has been shown to occur in environments with large number of SIP REFER transfers. This can be seen in <CmdBold>show sip statistics<CmdBold> and look for the RequestPending value showing an high and increasing output count.
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Bug Details Include
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