If you receive such an alert, please check the connection between the server and the CUCM. If the connection is down, contact your IT team. If the connection is alive, please check the trunk settings from the CUCM's web page.
The time set in Verba should be higher than the value set in CUCM.
Enabling/Disabling monitoring feature:
Required setting in Cisco UCM side: Use a SIP Trunk with a SIP Profile in which has the SIP Options Ping configured.