/mcpbe large enough such that the number of simultaneous IME calls made to enrolled numbers associated with that profile is always substantially less than 10 raised to the power of this number. "Substantially" should be at least a factor of ten. For example, if you always have less than 10,000 simultaneous IME calls for the patterns associated with this fallback profile, setting this value to 5 (10 to the power of 5 is 100,000) will give you plenty of headroom and you will not see this alarm. However, increasing this value also results in a small increase in the amount of time it takes to perform the fallback. As such, it should not be set arbitrarily large; it should be set just large enough to keep clear of this alarm. Another alternative to increasing this parameter is to add another fallback profile with a different fallback DID, and associate that fallback profile with a smaller number of enrolled DID patterns. This will allow you to get by with a smaller number of digits. Error Message %UC_CALLMANAGER-3-IMEQualityAlertEntry: %[ActiveCallCount=UInt][FallbackCallCount=UInt] [SetupAttempts=UInt][FailedAttempts=UInt][AppID=String][ClusterID=String][NodeID=String]: IME call quality problem. Explanation This alarm is generated when Unified CM is seeing a substantial number of IME calls fail back to PSTN, or fail to be set up, due to IP network quality problems. There are two triggers for this alarm. One is when a large fraction of the currently active IME calls have all requested fallback, or have fallen back, to the PSTN. The other is when a large fraction of the recent call attempts have not been made over IP, and instead have gone to the PSTN. Recommended Action Check your IP connectivity, and make sure it is good. If it looks good in general, you may need to look at CDRs, CMRs, and logs from the firewalls to determine what happened. Error Message %UC_CALLMANAGER-5-IMEQualityAlertExit: %[ActiveCallCount=UInt][FallbackCallCount=UInt] [SetupAttempts=UInt][FailedAttempts=UInt][AppID=String][ClusterID=String][NodeID=String]: IME call quality problem cleared. Explanation This alarm is generated when the Unified CM sees a significant reduction in the number of failed IME calls following generation of the IMEQualityAlertEntry alarm. This notice alarm indicates that the IP connectivity issues causing the initial generation of the IMEQualityAlertEntry alarm have abated. Recommended Action Continue to monitor IP connectivity for recurring issues Error Message %UC_CALLMANAGER-4-InvalidSubscription: %[SubscriptionId=UInt][IMEServer=String] [AppID=String][ClusterID=String][NodeID=String]: A message has been received from an IME server that contains a subscription identifier that is not handled by this node. Explanation Each node that communicates with a IME server saves a subscription identifier associated with each IME client instance. A IME server has sent a message with a subscription identifier that does not match any of the previously sent subscription identifiers. Recommended Action This may be a race condition if a IME client instance has been recently added or deleted. If this error continues, there may be a synchronization issue between this node and the IME server sending this message. 5/24/26, 3:34 AM System Error Messages for Cisco Unified Communications Manager 15 - Cisco https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/err_msgs/15_x/ccmalarms15.html 288/343