Rejecting Anonymous Requests in the Session Initiation Protocol (SIP)

Document Type Replaced Internet-Draft (individual)
Author Jonathan Rosenberg 
Last updated 2006-02-22 (latest revision 2005-11-10)
Replaced by RFC 5079
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Expired & archived
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This Internet-Draft is no longer active.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) allows for users to make anonymous calls. However, users receiving such calls have the right to reject them because they are anonymous. SIP has no way to indicate to the caller that the reason for call rejection was that the call was anonymous. Such an indication is useful to allow the call to be retried without anonymity. This specification defines a new SIP response code for this purpose.


Jonathan Rosenberg (

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