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Microsoft® Office Communications Server 2007 Resource Kit by Microsoft OCS Team, Stephanie Lindsey, Rick Kingslan, Mitch Tulloch, Kintan Brahmbhatt, John Clarkson, James O'Neil, Hao Yan, Byron Spurlock, Jochen Kunert, Rui Maximo, Jeremy Buch

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Understanding the Globally Routable User Agent URI

The Globally Routable User-Agent URI (GRUU) is an extension of SIP that is currently defined in an Internet-Draft, available at http://tools.ietf.org/id/draft-ietf-sip-gruu-13.txt. The GRUU is specifically designed to implement reliable routing to a specific device for an end user. Though a plain SIP URI such as janedoe@contoso.com is a URI that refers to a user, a GRUU is a URI that refers to a specific device. The Communicator client running on each user's computer will have its own GRUU that allows other applications to route messages specifically to that device. A GRUU can be used within multiple separate SIP dialogs to reach the same device. This works not just for client applications but ...

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