The Session Inititation Protocol (SIP) 'Join' Header

Document Type Replaced Internet-Draft (individual)
Last updated 2002-07-02
Replaced by draft-ietf-sip-join
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document defines a new header for use with SIP multi-party applications and call control. The Join header is used to logically join an existing SIP dialog with a new SIP dialog. This primitive can be used to enable a variety of features, for example: 'Barge-In', answering-machine-style 'Message Screening' and 'Call Center Monitoring'. Note that definition of these example features is non- normative.


Rohan Mahy (
Dan Petrie (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)