Establishing QoS and Security Preconditions for SDP Sessions

Document Type Expired Internet-Draft (mmusic WG)
Authors Jonathan Rosenberg  , Henning Schulzrinne  , Steve Donovan 
Last updated 1999-06-21
Stream Internet Engineering Task Force (IETF)
Expired & archived
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Stream WG state WG Document
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IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document discusses how network QoS and security establishment can be made a precondition to participation in sessions described by SDP. These preconditions require that the participant reserve network resources (or create a secure media channel) before continuing with the session. In the case of SIP, this effectively means that the 'phone won't ring' until the preconditions are met. These preconditions are described by new SDP parameters, defined in this document. The preconditions can be defined independently for each media stream.


Jonathan Rosenberg (
Henning Schulzrinne (
Steve Donovan (

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