Applies to: Exchange Server 2007 SP3, Exchange Server 2007 SP2, Exchange Server 2007 SP1, Exchange Server 2007
Topic Last Modified: 2007-07-11

For a Unified Messaging server to accept and process incoming calls, you must successfully configure several components:

This topic discusses the configuration steps that you must perform to enable connectivity and communication between PBXs, IP gateways, and Microsoft Exchange Server 2007 Unified Messaging servers.

We recommend that all customers who plan to deploy Exchange 2007 Unified Messaging obtain the assistance of a Unified Messaging specialist. A Unified Messaging specialist will help make sure that there is a smooth transition to Exchange 2007 Unified Messaging from a legacy voice mail system. Performing a new deployment or upgrading a legacy voice mail system requires significant PBX and Exchange 2007 Unified Messaging knowledge. For more information about how to contact a Unified Messaging specialist, see the Microsoft Exchange Server 2007 Unified Messaging (UM) Specialists Web site.

IP Gateways and IP PBXs

IP gateway devices are integral to deploying Exchange 2007 Unified Messaging in your organization. There are two types of IP gateway devices that you can use with Exchange 2007 Unified Messaging: an IP PBX and IP gateway. Both types of devices can exist in a single organization. However, you must configure each IP gateway or IP PBX device correctly to successfully deploy Exchange 2007 Unified Messaging.

The IP PBX or the IP gateway devices in your organization are the intermediary components between your organization's telephony network and your organization's data network. IP PBXs and IP gateways act as a "translator" and are used to convert the circuit-switched protocols that are found in your telephony network to the packet-switched protocol, IP, that is found in your data network.

  • For more information about IP gateways that Exchange Server 2007 supports, see Supported IP Gateways

  • For more information about IP PBX and PBX support in Exchange 2007, see IP PBX and PBX Support.

    Exchange 2007 Unified Messaging supports only Session Initiation Protocol (SIP) over Transmission Control Protocol (TCP).

Configuring the Components

You must perform additional management and configuration tasks when you are deploying a new Unified Messaging system or expanding an existing Unified Messaging system to accommodate more users, servers, UM dial plans, or IP gateways.

When you integrate your organization's telephony and data networks during the deployment of Exchange 2007 Unified Messaging, you must configure the telephony and data networking components correctly. You will have to configure the following components or interfaces when you deploy Unified Messaging:

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