| Abstract
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This document describes private extensions to the Session Initiation
Protocol (SIP) that enable a network of trusted SIP servers to assert
the identity of authenticated users, and the application of existing
privacy mechanisms to the identity problem. The use of these
extensions is only applicable inside an administrative domain with
previously agreed-upon policies for generation, transport and usage
of such information. This document does NOT offer a general privacy
or identity model suitable for use between different trust domains,
or use in the Internet at large.
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