| Abstract
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This memo provides information for the Internet community. It
describes a useful way to conceptualize the use of the standard SIP
(Session Initiation Protocol) Request-URI (Uniform Resource
Identifier) that the authors and many members of the SIP community
think is suitable as a convention. It does not define any new
protocol with respect to RFC 2543.
In a conventional telephony environment, extended service
applications often use call state information, such as calling party,
called party, reason for forward, etc, to infer application context.
In a SIP/2.0 call, much of this information may be either non-
existent or unreliable. This document proposes a mechanism to
communicate context information to an application. Under this
proposal, a client or proxy can communicate context through the use
of a distinctive Request-URI. This document continues with examples
of how this mechanism could be used in a voice mail application.
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