The MCT controller dials the FAC for MCT deactivation to deactivate MCT. Deactivation frees any blocked resources that were involved in the trace. When all parties hang up, the system disconnects the MCT voice recorder.

If the controller list configured by the command change mct-group-extensions is empty which means that no mct-controller is administered, then MCT is deactivated when all parties hang up. An SNMP trap is generated to record the activation of MCT. This SNMP trap is critical while configuring with all SIP endpoints, as the endpoint cannot be the MCT Controller.