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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