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Cisco Bug: CSCvh92378 - High CPU utlization with presence feature when reset is issued under voice register global

Last Modified

Nov 27, 2019

Products (1)

  • Cisco 3G Wireless WAN

Known Affected Releases


Description (partial)

Customer has configured around 400 SIP phones with presence, shared-line and blf features enabled on CME ISR G2. 
When customer tries a reset under 'voice register global' the router enters into a state of high CPU (reaching 100%) for some time while phones unregister due to that. Once the router has less than 50 phones, they start registering again (all of them) very quickly and at that point the CPU is under 8%.
Once all phones register back, the CPU stays ok for some seconds and then it starts gradually rising up again until it reaches 100% which then triggers phones to get unregistered again.

This causes the router to be in a high CPU loop when CPU recovers and then rises again to 100% over and over.

This keeps happening either until the router is rebooted or it crashes.

Reset under voice register global in a stress scenario (A lot of phones registered to CME that involve SIP subscription)

Issue happens when phones unregister and CME deletes the virtual dial-peer, then the CME needs to check the subscription status and this triggers a CPU problem.
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