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Guidelines for End-to-End Support of the RTP Control Protocol (RTCP) in Back-to-Back User Agents (B2BUAs) (RFC8079) Disclosure Number: IPCOM000249392D
Original Publication Date: 2017-Feb-01
Included in the Prior Art Database: 2017-Feb-23
Document File: 32 page(s) / 42K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

L. Miniero: AUTHOR [+2]


Session Initiation Protocol (SIP) [RFC3261] Back-to-Back User Agents (B2BUAs) are SIP entities that can act as a logical combination of both a User Agent Server (UAS) and a User Agent Client (UAC). As such, their behaviour is not always completely adherent to standards and can lead to unexpected situations. [RFC7092] presents a taxonomy of the most commonly deployed B2BUA implementations and describes how they differ in terms of the functionality and features they provide.

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Internet Engineering Task Force (IETF)                        L. Miniero Request for Comments: 8079                                      Meetecho Category: Standards Track                              S. Garcia Murillo ISSN: 2070-1721                                                  Medooze                                                               V. Pascual                                                                   Oracle                                                            February 2017

 Guidelines for End-to-End Support of the RTP Control Protocol (RTCP) in                    Back-to-Back User Agents (B2BUAs)


   SIP Back-to-Back User Agents (B2BUAs) are often designed to also be    on the media path, rather than just to intercept signalling.  This    means that B2BUAs often implement an RTP or RTP Control Protocol    (RTCP) stack as well, thus leading to separate multimedia sessions    that the B2BUA correlates and bridges together.  If not disciplined,    this behaviour can severely impact the communication experience,    especially when statistics and feedback information contained in RTCP    messages get lost because of mismatches in the reported data.

   This document defines the proper behaviour B2BUAs should follow when    acting on both the signalling plane and media plane in order to    preserve the end-to-end functionality of RTCP.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Miniero, et al.              Standards Track                    [Page 1]
 RFC 8079               RTCP Translation in B2BUAs          February 2017

 Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    ( in effect on the date of    publication of this document.  Please review these documents    carefully, as they descri...