Microsoft Exchange Performance Counters

Microsoft Exchange Unified Messaging Fax Answering Performance counters

There are many performance counters that can be used to maintain and troubleshoot a Microsoft Exchange Server 2010 Unified Messaging server. Unified Messaging performance counters are used to 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. Object: MSExchangeUMFax

Counter Name	Description
Percentage of Successful Valid Fax Calls
Total Invalid Fax Calls	Total Invalid Fax Calls is the total number of fax call requests to extensions that resolved to mailboxes that are not enabled for fax.
Total Successful Valid Fax Calls	Total Successful Valid Fax Calls is the total number of valid fax call requests to extensions that resolved to mailboxes that are enabled for fax and were successfully transferred to a fax partner.
Total Valid Fax Calls	Total Valid Fax Calls is the total number of valid fax call requests to extensions that resolved to mailboxes that are enabled for fax and were successfully transferred to the fax partner.