Protocol Action: 'Guidelines to support RTCP end-to-end in Back-to-Back User Agents (B2BUAs)' to Proposed Standard (draft-ietf-straw-b2bua-rtcp-17.txt)

The IESG <> Thu, 22 December 2016 17:26 UTC

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Subject: Protocol Action: 'Guidelines to support RTCP end-to-end in Back-to-Back User Agents (B2BUAs)' to Proposed Standard (draft-ietf-straw-b2bua-rtcp-17.txt)
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The IESG has approved the following document:
- 'Guidelines to support RTCP end-to-end in Back-to-Back User Agents
  (draft-ietf-straw-b2bua-rtcp-17.txt) as Proposed Standard

This document is the product of the Sip Traversal Required for
Applications to Work Working Group.

The IESG contact persons are Alexey Melnikov, Ben Campbell and Alissa

A URL of this Internet Draft is:

Technical Summary

SIP Back-to-Back User Agents (B2BUAs) are often envisaged to also be on the media path, rather than just intercepting signalling. This means that B2BUAs often implement an RTP/RTCP stack as well, whether to act as media transcoders or to just passthrough the media themselves, thus leading to separate multimedia sessions that the B2BUA correlates and bridges together. If not disciplined, though, this behaviour can severely impact the communication experience, especially when statistics and feedback information contained in RTCP packets get lost because of mismatches in the reported data.
This document defines the proper behaviour B2BUAs should follow when also acting on the signalling/media plane in order to preserve the end-to-end functionality of RTCP.

Working Group Summary

The WG path of this document was reasonably short and efficient. Several technical comments were made during reviews and all were resolved with consensus. There is consensus in the STRAW WG to publish this document.

Document Quality

The guidelines and procedures in the document is based on input and experience from the implementer community.


Who is the Document Shepherd?
Christer Holmberg ( -- STRAW WG co-chair)
Who is the Responsible Area Director?
Ben Campbell <>