SIP 183 Session Progress Message

Document Type Expired Internet-Draft (individual)
Authors Jonathan Rosenberg  , Henning Schulzrinne  , Matthew Cannon  , Steve Donovan  , Adam Roach  , John Hearty 
Last updated 1999-06-22
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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This Internet-Draft is no longer active.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


This document describes a proposed extension of the Session Initia- tion Protocol. This extension would add the 183 Session Progress response message. The introduction of the 183 informational response message would allow a called user agent to indicate to the calling user agent whether or not the calling user agent should apply local alerting for the session. The existing 180 Ringing message would indicate that the calling user agent has the option of providing local alerting (and generally should). The 183 Session Progress message would indi- cate that the calling user agent should not provide local alerting and should establish a media session to be used by the called user agent to indicate the status of the session setup request as part of the indicated media stream.


Jonathan Rosenberg (
Henning Schulzrinne (
Matthew Cannon (
Steve Donovan (
Adam Roach (
John Hearty (

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