CUCM 12.5 / IM&P 12.5: 503 (Service Unavailable) when extending Presence Web Service Endpoint
I have the following constellation:
Cisco Unified CM IM and Presence: 220.127.116.1100-22
We use the "Presence Web Service Interface" to receive notifications about changes of the presence state of users/phones. Therefore we register with the IM&Presence Server and receive notifications about changes - which works most of the time fine.
The problem is when we extend the Endpoint-Registration (which we do every hour - no other operations are done), we sometimes receive the error code 503 (Service Unavailable).
The documentation lists the following descriptions about the code:
- Max CPU utilization reached
- Max number of requests per second reached
Both should not be the problem because nothing other is executing on the CUCM/IM&P so the server should not be overloaded. Also as we send only every hour a message to the server the max number of requests should not be reached.
The same konfiguration we have running with a CUCM/IM&P 11.5 without any problem.
Does anyone have an idea what the problem is or how I can check where the problem is?
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