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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Session Initiation Protocol Working Group of the IETF.
Title : The SIP Referred-By Mechanism
Author(s) : R. Sparks
Filename : draft-ietf-sip-referredby-03.txt
Pages : 25
Date : 2003-8-6
The SIP REFER method  provides a mechanism where one party (the
referrer) gives a second party (the referree) an arbitrary URI to
reference. If that URI is a SIP URI, the referree will send a SIP
request, often an INVITE, to that URI (the refer target). This
document extends the REFER method allowing the referrer to provide
information about the reference to the refer target using the
referree as an intermediary. This information includes the identity
of the referrer and the URI to which the referrer referred. The
mechanism utilizes S/MIME to help protect this information from a
malicious intermediary. This protection is optional, but a recipient
may refuse to accept a request unless it is present.
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