Annotated Example SDP for WebRTC
draft-ietf-rtcweb-sdp-11

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 00
• 01
• 02
• 03
• 04
• 05
• 06
• 07
• 08
• 09
• 10
• 11

Network Working Group                                      S. Nandakumar
Internet-Draft                                               C. Jennings
Intended status: Informational                                     Cisco
Expires: April 11, 2019                                 October 08, 2018

                    Annotated Example SDP for WebRTC
                        draft-ietf-rtcweb-sdp-11

Abstract

   The Real-Time Communications in WEB-browsers (Rtcweb) working group
   is charged to provide protocol support for direct interactive rich
   communication using audio, video and data between two peers' web
   browsers.  With in the Rtcweb framework, Session Description protocol
   (SDP) is used for negotiating session capabilities between the peers.
   Such a negotiation happens based on the SDP Offer/Answer exchange
   mechanism.

   This document provides an informational reference in describing the
   role of SDP and the Offer/Answer exchange mechanism for the most
   common Rtcweb use-cases.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 11, 2019.

Copyright Notice

   Copyright (c) 2018 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
   (http://trustee.ietf.org/license-info) in effect on the date of

Nandakumar & Jennings    Expires April 11, 2019                 [Page 1]
Internet-Draft                 SDP4WebRTC                   October 2018

   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  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  SDP and the WebRTC  . . . . . . . . . . . . . . . . . . . . .   3
   4.  Offer/Answer and the WebRTC . . . . . . . . . . . . . . . . .   5
   5.  WebRTC Session Description Examples . . . . . . . . . . . . .   6
     5.1.  Some Conventions  . . . . . . . . . . . . . . . . . . . .   7
     5.2.  Basic Examples  . . . . . . . . . . . . . . . . . . . . .   9
       5.2.1.  Audio Only Session  . . . . . . . . . . . . . . . . .   9
       5.2.2.  Audio/Video Session . . . . . . . . . . . . . . . . .  14
         5.2.2.1.  IPv4 audio/video session  . . . . . . . . . . . .  14
         5.2.2.2.  Dual Stack audio/video session  . . . . . . . . .  19
       5.2.3.  Data Only Session . . . . . . . . . . . . . . . . . .  24
       5.2.4.  Audio Call On Hold  . . . . . . . . . . . . . . . . .  27
       5.2.5.  Audio with DTMF Session . . . . . . . . . . . . . . .  31
       5.2.6.  One Way Audio/Video Session - Document Camera . . . .  35
       5.2.7.  Audio, Video Session with BUNDLE Support Unknown  . .  39
       5.2.8.  Audio, Video and Data Session . . . . . . . . . . . .  45
       5.2.9.  Audio, Video Session with BUNDLE Unsupported  . . . .  49
       5.2.10. Audio, Video BUNDLED, but Data (Not BUNDLED)  . . . .  54
       5.2.11. Audio Only, Add Video to BUNDLE . . . . . . . . . . .  59
     5.3.  MultiResolution, RTX, FEC Examples  . . . . . . . . . . .  66
       5.3.1.  Sendonly Simulcast Session with 2 cameras and 2
               encodings     per camera  . . . . . . . . . . . . . .  66
       5.3.2.  Successful SVC Video Session  . . . . . . . . . . . .  74
       5.3.3.  Successful Simulcast Video Session with
               Retransmission  . . . . . . . . . . . . . . . . . . .  78
       5.3.4.  Successful 1-way Simulcast Session with 2 resolutions
               and         RTX - One resolution rejected . . . . . .  83
       5.3.5.  Simulcast Video Session with Forward Error Correction  88
     5.4.  Others  . . . . . . . . . . . . . . . . . . . . . . . . .  93
       5.4.1.  Audio Session - Voice Activity Detection  . . . . . .  93
       5.4.2.  Audio Conference - Voice Activity Detection . . . . .  97
       5.4.3.  Successful legacy Interop Fallback with bundle-only . 100
       5.4.4.  Legacy Interop with RTP/AVP profile . . . . . . . . . 105