Applies to: Exchange Server 2007 SP3, Exchange Server 2007 SP2, Exchange Server 2007 SP1, Exchange Server 2007
Topic Last Modified: 2007-10-19

There are many performance counters that can be used to maintain and troubleshoot a computer that is running Microsoft Exchange Server 2007 that has the Unified Messaging (UM) server role installed. Unified Messaging performance counters measure quantities of information or data for Unified Messaging based on the number, size, duration, and rate of data that is being requested or received.

General Performance Counters

The following table provides a list of the general performance counters that can be used to monitor Exchange 2007 Unified Messaging.

General performance counters for Unified Messaging

Performance counter	Performance object	Description
Average Call Duration	MSExchangeUMGeneral	Average Call Duration is the average duration, in seconds, of calls since the service was started.
Average Recent Call Duration	MSExchangeUMGeneral	Average Recent Call Duration is the average duration, in seconds, of the last 50 calls.
Call Duration Exceeded	MSExchangeUMGeneral	Call Duration Exceeded is the number of calls that were disconnected because they exceeded the UM maximum call length. This number includes all types of calls, including fax calls.
Calls Disconnected by User Failure	MSExchangeUMGeneral	Calls Disconnected by User Failure is the total number of calls disconnected after too many user entry failures.
Calls Rejected	MSExchangeUMGeneral	Calls Rejected is the total number of new call invitations that have been rejected.
Calls Rejected per Second	MSExchangeUMGeneral	Calls Rejected per Second is the number of new call invitations that have been rejected in the last second.
Current Auto Attendant Calls	MSExchangeUMGeneral	Current Auto Attendant Calls is the number of auto attendant calls that are currently connected to the UM server.
Current Calls	MSExchangeUMGeneral	Current Calls is the number of calls that are currently connected to the UM server.
Current CAS Connections	MSExchangeUMGeneral	Current CAS Connections is the number of connections that are currently open between the Unified Messaging server and Client Access servers.
Current Fax Calls	MSExchangeUMGeneral	Current Fax Calls is the number of fax calls that are currently connected to the UM server. Voice calls become fax calls after a fax tone is detected.
Current Play on Phone Calls	MSExchangeUMGeneral	Current Play on Phone Calls is the number of outbound calls initiated to play back messages.
Current Prompt Editing Calls	MSExchangeUMGeneral	Current Prompt Editing Calls is the number of logged on users who are editing custom prompts.
Current Subscriber Access Calls	MSExchangeUMGeneral	Current Subscriber Access Calls is the number of logged on subscribers who are currently connected to the UM server.
Current Unauthenticated Pilot Number Calls	MSExchangeUMGeneral	Current Unauthenticated Pilot Number Calls is the number of voice calls to the pilot number that have not yet been authenticated.
Current Voice Calls	MSExchangeUMGeneral	Current Voice Calls is the number of voice calls that are currently connected to the UM server.
Delayed Calls	MSExchangeUMGeneral	Delayed Calls is the number of calls that experienced one or more delays longer than 2 seconds.
Total Calls	MSExchangeUMGeneral	Total Calls is the number of calls since the service was started.
Total Calls per Second	MSExchangeUMGeneral	Total Calls per Second is the number of new calls that arrived in the last second.
Total Play on Phone Calls	MSExchangeUMGeneral	Total Play on Phone Calls is the total number of Play on Phone calls that have been initiated since the service was started.
User Response Latency	MSExchangeUMGeneral	User Response Latency is the average response time, in milliseconds, for the system to respond to a user request. This average is calculated over the last 25 calls. This counter is limited to calls that require significant processing.

The following table provides a list of the general performance counters that were added to Exchange 2007 Service Pack 1 (SP1) that can be used to monitor Unified Messaging.

General performance counters for Unified Messaging in Exchange 2007 SP1

Performance counter	Performance object	Description
OCS User Event Notifications	MSExchangeUMGeneral	OCS User Event Notifications is the total number of OCS User Event notifications that have occurred since the service was started.

For More Information

For more information about performance objects and counters that are available for Exchange 2007 Unified Messaging, see Performance Counter Reference for Unified Messaging.
For more information about how to troubleshoot a Unified Messaging server, see Unified Messaging Server Issues.