Session Description Protocol (SDP) Format for Binary Floor Control Protocol (BFCP) Streams
RFC 8856

Document Type RFC - Proposed Standard (January 2021; No errata)
Obsoletes RFC 4583
Authors Gonzalo Camarillo  , Tom Kristensen  , Christer Holmberg 
Last updated 2021-01-19
Stream IETF
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Stream WG state Submitted to IESG for Publication
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IESG IESG state RFC 8856 (Proposed Standard)
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Internet Engineering Task Force (IETF)                      G. Camarillo
Request for Comments: 8856                                      Ericsson
Obsoletes: 4583                                            T. Kristensen
Category: Standards Track                                         Jotron
ISSN: 2070-1721                                              C. Holmberg
                                                                Ericsson
                                                            January 2021

   Session Description Protocol (SDP) Format for Binary Floor Control
                        Protocol (BFCP) Streams

Abstract

   This document defines the Session Description Protocol (SDP) offer/
   answer procedures for negotiating and establishing Binary Floor
   Control Protocol (BFCP) streams.

   This document obsoletes RFC 4583.

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
   https://www.rfc-editor.org/info/rfc8856.

Copyright Notice

   Copyright (c) 2021 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
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction
   2.  Conventions
   3.  Floor Control Roles
   4.  Fields in the "m=" Line
   5.  SDP Attributes
     5.1.  SDP 'floorctrl' Attribute
     5.2.  SDP 'confid' Attribute
     5.3.  SDP 'userid' Attribute
     5.4.  SDP 'floorid' Attribute
     5.5.  SDP 'bfcpver' Attribute
   6.  Multiplexing Considerations
   7.  BFCP Connection Management
     7.1.  TCP Connection Management
   8.  TLS/DTLS Considerations
   9.  ICE Considerations
   10. SDP Offer/Answer Procedures
     10.1.  Generating the Initial SDP Offer
     10.2.  Generating the SDP Answer
     10.3.  Offerer Processing of the SDP Answer
     10.4.  Modifying the Session
   11. Examples
   12. Security Considerations
   13. IANA Considerations
     13.1.  Registration of SDP 'proto' Values
     13.2.  Registration of the SDP 'floorctrl' Attribute
     13.3.  Registration of the SDP 'confid' Attribute
     13.4.  Registration of the SDP 'userid' Attribute
     13.5.  Registration of the SDP 'floorid' Attribute
     13.6.  Registration of the SDP 'bfcpver' Attribute
   14. Changes from RFC 4583
   15. References
     15.1.  Normative References
     15.2.  Informative References
   Acknowledgements
   Authors' Addresses

1.  Introduction

   As discussed in the BFCP (Binary Floor Control Protocol)
   specification [RFC8855], a given BFCP client needs a set of data in
   order to establish a BFCP connection to a floor control server.  This
   data includes the transport address of the server, the conference
   identifier, and the user identifier.

   One way for clients to obtain this information is to use a Session
   Description Protocol (SDP) offer/answer exchange [RFC3264].  This
   document specifies how to encode this information in the SDP session
   descriptions that are part of such an offer/answer exchange.

   User agents typically use the offer/answer model to establish a
   number of media streams of different types.  Following this model, a
   BFCP connection is described as any other media stream by using an
   SDP "m=" line, possibly followed by a number of SDP lines that also
   apply to the BFCP connection.

   Section 4 defines how the field values in an "m=" line representing a
   BFCP connection are set.

   Section 5 defines SDP attributes that are used when negotiating a
   BFCP connection.

   Section 6 defines multiplexing considerations for a BFCP connection.

   Section 7 defines procedures for managing a BFCP connection.

   Section 8 defines TLS and DTLS considerations when negotiating a BFCP
   connection.

   Section 9 defines considerations regarding Interactive Connectivity
   Establishment (ICE) [RFC8445] when negotiating a BFCP connection.

   Section 10 defines the SDP offer/answer procedures for negotiating a
   BFCP connection.

   This document obsoletes RFC 4583 [RFC4583].  Section 14 summarizes
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