Use this procedure to verify Active Call Count.

The Active Call Count value indicates the number of active calls on the Session Manager instance. Active calls are calls that were already active before the Session Manager was placed in the denial state. When you change the state to Deny New Service, the application does not drop calls that are currently processed.

To prevent any impact on calls that are active, the Active Call Count must be zero before proceeding with the Session Manager upgrade. If the administrator decides to continue the upgrade and if the active call count is not zero, the active calls are dropped.