Annotated Example SDP for WebRTC
draft-ietf-rtcweb-sdp-12

Document Type Active Internet-Draft (individual)
Last updated 2020-06-07 (latest revision 2020-05-09)
Replaces draft-nandakumar-rtcweb-sdp
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Network Working Group                                      S. Nandakumar
Internet-Draft                                               C. Jennings
Intended status: Informational                                     Cisco
Expires: November 10, 2020                                  May 09, 2020

                    Annotated Example SDP for WebRTC
                        draft-ietf-rtcweb-sdp-12

Abstract

   The Web Real Time Communications (WebRTC) family of protocols defines
   mechanisms for direct interactive rich communication using audio,
   video and data between two peers' web browsers.  Within the WebRTC
   framework, the 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 WebRTC use-cases.

Status of This Memo

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   This Internet-Draft will expire on November 10, 2020.

Copyright Notice

   Copyright (c) 2020 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

Nandakumar & Jennings   Expires November 10, 2020               [Page 1]
Internet-Draft                 SDP4WebRTC                       May 2020

   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 . . . . . . . . . . . . . . . . .   6
   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
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