Architecture and Design Principles of the Session Initiation Protocol (SIP)

Document Type Expired Internet-Draft (individual)
Authors Henning Schulzrinne  , Jonathan Rosenberg 
Last updated 2005-07-20
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The Session Initiation Protocol (SIP) and its many extensions and supporting technologies define a solution for multimedia communications on the Internet. Much of the design and architecture for SIP is based on a key set of architectural principles which, while commonly discussed on mailing lists and other forums, have not been explicitly captured. This document seeks to rectify that gap by outlining the key set of architectural and design principles underlying SIP.


Henning Schulzrinne (
Jonathan Rosenberg (

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