Cisco Bug: CSCuq61286 - MWI Routing loop causes leak
Dec 18, 2019
- Cisco Unified Communications Manager (CallManager)
Known Affected Releases
Symptom: Call Flow: Unity Connection -----> SME Cluster---->Leaf Cluster A misconfiguration on UCM resulting in a routing loop can create an instance where UCM will forward SIP Notifies for MWI between clusters resulting in an MWI leak. Conditions: SME sends a MWI SIP Notify-1 to the Leaf cluster via RL, which constitutes SIP trunk as its member pointing to Leaf cluster. Now, Leaf cluster on receiving this MWI SIP Notify-1 from the SME cluster, hits the RL which has 2 RGs,each of which is configured with 2 SIP trunks pointing to SME cluster. So, basically the above MWI SIP Notify-1 from SME cluster, triggered 4 SIP Notifys back to it by the Leaf cluster. The MWI DN "XXXX", points to the RL , which constitutes SIP trunk as its member pointing to the Leaf cluster,again for each of these requests there will be a SIPNotify to the leaf cluster. And for each of these SIPNotify, there will again be another 4 SIP Notifys sent back the SME cluster. This cumulative behaviour results in the queue depth of SIPHandler getting exhausted and results in core dump.
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