Session Description Protocol (SDP) Source Filters
RFC 4570

Approval announcement
Draft of message to be sent after approval:

From: The IESG <>
To: IETF-Announce <>
Cc: Internet Architecture Board <>,
    RFC Editor <>, 
    mmusic mailing list <>, 
    mmusic chair <>
Subject: Protocol Action: 'Session Description Protocol (SDP) 
         Source Filters' to Proposed Standard 

The IESG has approved the following document:

- 'Session Description Protocol (SDP) Source Filters '
   <draft-ietf-mmusic-sdp-srcfilter-11.txt> as a Proposed Standard

This document is the product of the Multiparty Multimedia Session Control 
Working Group. 

The IESG contact persons are Jon Peterson and Cullen Jennings.

A URL of this Internet-Draft is:

Technical Summary
This document defines a "source filter" attribute for the Session Description 
protocol (SDP) which provides IP address-based filtering for media sessions. 
Recipients of an SDP message containing the source filter attribute will allow 
or deny media as appropriate given the origination IP address of the media. This
mechanism is not intended to be used in SDP offer/answer cases (such as SIP), 
but has significant applicability to multicast cases. The limitations of 
address-based filtering as a security mechanism are highlighted in the document.
Working Group Summary
The MMUSIC WG supported the advancement of this document. Previous efforts to 
define a similar address-based filtering mechanism that applied to offer/answer 
ases, however, were unable to get the consensus of the group.
Protocol Quality
This document was reviewed for the IESG by Jon Peterson.