When external or anonymous callers place a call by using an external business telephone number, or an internal anonymous caller places a call to an internal extension number, they are presented with voice prompts to help them navigate the Unified Messaging menu system. The UM auto attendant is a set of voice prompts or .wav files that are played to callers in place of a human operator or receptionist when they call into an organization that has Exchange 2007 Unified Messaging. Exchange 2007 Unified Messaging enables you to create one or more auto attendants depending on the needs of your organization. For more information about UM auto attendants, see Understanding Unified Messaging Auto Attendants.

When a call is received by an Exchange 2007 Unified Messaging server, the Unified Messaging server performs a Lightweight Directory Access Protocol (LDAP) query to an Active Directory directory service domain controller to determine how to handle the incoming call.

Figure 1 illustrates the message flow process when Unified Messaging auto attendants are used in an Exchange 2007 organization.

For More Information

• For more information about the different types of messages that an Exchange 2007 Unified Messaging server handles, see Overview of the Unified Messaging Call Processing.
  
  
• For more information about voice and fax message flow, see Unified Messaging Voice and Fax Call Processing.
  
  
• For more information about Outlook Voice Access message flow, see Unified Messaging Outlook Voice Access Call Processing.
  
  
• For more information about Play on Phone message flow, see Unified Messaging Play on Phone Call Processing.
  
  

To ensure that you are reading the most up-to-date information and to find additional Exchange Server 2007 documentation, visit the Exchange Server TechCenter.

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Figure 1   UM auto attendant message flow