The Microsoft Exchange Unified Messaging service on the Mailbox server has a maximum call limit of {0}. The current calls ...

The Microsoft Exchange Unified Messaging service on the Mailbox server has a maximum call limit of {0}. The current calls on the server are {1}. This warning will be logged as long as the current calls are more than 80% of the maximum call limit. When the current call exceeds the maximum call limit, calls will be rejected.