A missed call notification could not be generated because the template '%1' is not supported by any of the Exchange UM servers ...

A missed call notification could not be generated because the template '%1' is not supported by any of the Exchange UM servers in dial plan %2.
Failure occurrences: %3, since %4.
Cause: A new routing script may have been deployed that requests a template that is not available on the deployed Exchange UM servers.
Resolution:
Upgrade the Exchange UM servers, remove the script, or modify the script to use an available template.