We had a strange behavior in our customer site (UCCE 11.6).
Agents were put to not ready state with status call over lap. Checked the CVP logs, found rejection from CUCM with 404-not found.
Upon checking with TAC, we found the CUCM rejected the calls because of missing the Agent phones partition in CSS of CVP SIP trunk. Administrators are confirming that there was no change made to the system at all. For one hour it missed this configuration and came back without any action.
Did anyone faced the issue ? What could be the cause ?
Have you checked replication between the CM nodes? Is it possible that CVP/ICM is sending the traffic to a CM node that isn't in the CM group for the SIP trunk? I would advise selecting the 'run on all nodes' box on the SIP trunk to CVP.