Session Description Protocol (SDP) WebSocket Connection URI Attribute
draft-ietf-bfcpbis-sdp-ws-uri-09

Document Type Active Internet-Draft (bfcpbis WG)
Last updated 2017-03-15 (latest revision 2017-02-06)
Replaces draft-ram-bfcpbis-sdp-ws-uri
Stream IETF
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Stream WG state Submitted to IESG for Publication Nov 2016
Document shepherd Charles Eckel
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Responsible AD Alissa Cooper
Send notices to "Charles Eckel" <eckelcu@cisco.com>
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RFC Editor RFC Editor state AUTH48
BFCPBIS Working Group                                  Ram. Ravindranath
Internet-Draft                                              G. Salgueiro
Intended status: Standards Track                                   Cisco
Expires: August 10, 2017                                February 6, 2017

 Session Description Protocol (SDP) WebSocket Connection URI Attribute
                    draft-ietf-bfcpbis-sdp-ws-uri-09

Abstract

   The WebSocket protocol enables bidirectional real-time communication
   between clients and servers in web-based applications.  This document
   specifies extensions to Session Description Protocol (SDP) for
   application protocols using WebSocket as a transport.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on August 10, 2017.

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   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
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Ravindranath & Salgueiro Expires August 10, 2017                [Page 1]
Internet-Draft           WebSocket SDP Attribute           February 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  SDP Considerations  . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.2.  websocket-uri SDP Attribute . . . . . . . . . . . . . . .   3
     3.3.  websocket-uri Multiplexing Considerations . . . . . . . .   4
   4.  SDP Offer/Answer Procedures . . . . . . . . . . . . . . . . .   4
     4.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.2.  Generating the Initial Offer  . . . . . . . . . . . . . .   5
     4.3.  Generating the Answer . . . . . . . . . . . . . . . . . .   5
     4.4.  Offerer Processing of the Answer  . . . . . . . . . . . .   6
     4.5.  Modifying the Session . . . . . . . . . . . . . . . . . .   6
     4.6.  Offerless INVITE Scenarios  . . . . . . . . . . . . . . .   7
   5.  Procedures at WebSocket Client  . . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  Registration of the 'websocket-uri' SDP Media Attribute .   8
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   The WebSocket protocol [RFC6455] enables bidirectional message
   exchange between clients and servers on top of a persistent TCP
   connection (optionally secured with Transport Layer Security (TLS)
   [RFC5246]).  The initial protocol handshake makes use of Hypertext
   Transfer Protocol (HTTP) [RFC7230] semantics, allowing the WebSocket
   protocol to reuse existing HTTP infrastructure.

   Modern web browsers include a WebSocket client stack compliant with
   the WebSocket API [WS-API] as specified by the W3C.  It is expected
   that other client applications (e.g., those running on personal
   computers, mobile devices, etc.) will also make a WebSocket client
   stack available.  Several specifications have been written that
   define how different applications can use a WebSocket subprotocol as
   a reliable transport mechanism.

   For example, [RFC7118] defines WebSocket subprotocol as a reliable
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