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.
  

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

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:

• The connection from the IP gateway interface to the PBX.
  For more information about how to configure your PBX interface to communicate with your supported IP gateway, see the product documentation that is specific to your PBX. For more information about how to configure the IP gateway to the PBX interface, see How to Configure an IP Gateway to Communicate with a PBX.
  
• The connection from the IP gateway interface to the Exchange Server 2007 Unified Messaging server.
  For more information about how to configure the supported IP gateway interfaces for Exchange 2007 Unified Messaging, see How to Configure an IP Gateway or IP PBX for Use with a Unified Messaging Server.
  
• The connection from the Unified Messaging server to the IP gateway interface.
  For more information about how to configure the Unified Messaging server to communicate correctly with an IP gateway interface, see How to Connect a Unified Messaging Server to a Supported IP Gateway.
  
• The connection from the PBXs in your organization to communicate with your IP gateways.
  For more information about how to configure the IP gateway to the PBX interface, see How to Configure an IP Gateway to Communicate with a PBX.
  

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