Cisco Bug: CSCsg31865 - MGCP CAS trunk intermittently sends back 501 response when glare occurs
Feb 22, 2014
- Cisco 2800 Series Integrated Services Routers
Known Affected Releases
Symptom: Inbound and outbound on a Cisco IOS VoIP gateway calls stop processing through a trunk on a MGCP controlled CAS circuit. When the Cisco CallManager is used as the Call Agent, inbound calls from the PSTN may experience dead-air. Conditions: Intermittently under some glare conditions (when the MGCP controlled timeslots are accessed simultaneously for an inbound and outbound call), the IOS gateway may respond to a Call Agent MGCP command with a 501 response. When the Call Agent is a Cisco Callmanager, this response code will cause the Callmanager to place the trunk into a out-of-service (OOS) state until manual intervention just as resetting the GW or shut/no-shut takes place on the gateway.
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