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Overview of Unified Messaging Server Topologies

 

Applies to: Exchange Server 2007 SP3, Exchange Server 2007 SP2, Exchange Server 2007 SP1, Exchange Server 2007

Topic Last Modified: 2009-04-20

Microsoft Exchange Server 2007 supports a server architecture that distributes server tasks among different server roles. In this kind of architecture, a computer that is running Exchange Server 2007 that has the Unified Messaging server role installed accepts incoming calls. The Unified Messaging server then routes the messages to the appropriate server for processing. This could be the Client Access server, the Mailbox server, or the Hub Transport server. The server that has the Hub Transport server role installed was formerly known as a bridgehead server.

This topic describes the relationship between the Exchange Server 2007 Unified Messaging servers on a typical network and the telephony components in an organization.

Figure 1 illustrates an Exchange Server 2007 Unified Messaging topology that contains a single Private Branch eXchange (PBX).

Simple UM Topology

 

Figure 2 illustrates an Exchange Server 2007 Unified Messaging topology that contains multiple PBXs.

Advanced UM Topology

Figure 3 illustrates centralized management system for an Exchange Server 2007 Unified Messaging topology that contains multiple PBXs. This configuration enables the placement of all Unified Messaging servers in a single location. IP gateways are deployed in each branch office, and replace the legacy voice messaging system for each branch office. Because IP gateways are close to PBX, the Hub Transport, Client Access and the Mailbox servers can be removed from both the Mexico City and the Austin sites.

noteNote:
The roundtrip time between the gateway and UM servers should not be more than 1 second.
Advanced Organization Unified Messaging Topology -

 

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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