Annotated Example SDP for WebRTC
draft-ietf-rtcweb-sdp-06
Network Working Group S. Nandakumar
Internet-Draft C. Jennings
Intended status: Informational Cisco
Expires: October 12, 2017 April 10, 2017
Annotated Example SDP for WebRTC
draft-ietf-rtcweb-sdp-06
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.
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This Internet-Draft will expire on October 12, 2017.
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Provisions Relating to IETF Documents
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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 . . . . . . . . . . . . . . . . . 13
5.2.2.1. IPv4 audio/video session . . . . . . . . . . . . 14
5.2.2.2. Dual Stack audio/video session . . . . . . . . . 18
5.2.3. Data Only Session . . . . . . . . . . . . . . . . . . 22
5.2.4. Audio Call On Hold . . . . . . . . . . . . . . . . . 24
5.2.5. Audio with DTMF Session . . . . . . . . . . . . . . . 27
5.2.6. One Way Audio/Video Session - Document Camera . . . . 31
5.2.7. Audio, Video Session with BUNDLE Support Unknown . . 35
5.2.8. Audio, Video and Data Session . . . . . . . . . . . . 40
5.2.9. Audio, Video Session with BUNDLE Unsupported . . . . 43
5.2.10. Audio, Video BUNDLED, but Data (Not BUNDLED) . . . . 48
5.2.11. Audio Only, Add Video to BUNDLE . . . . . . . . . . . 53
5.3. MultiResolution, RTX, FEC Examples . . . . . . . . . . . 58
5.3.1. Sendonly Simulcast Session with 2 cameras and 2
encodings per camera . . . . . . . . . . . . . . 59
5.3.2. Successful SVC Video Session . . . . . . . . . . . . 65
5.3.3. Successful Simulcast Video Session with
Retransmission . . . . . . . . . . . . . . . . . . . 69
5.3.4. Successful 1-way Simulcast Session with 2 resolutions
and RTX - One resolution rejected . . . . . . 73
5.3.5. Simulcast Video Session with Forward Error Correction 77
5.4. Others . . . . . . . . . . . . . . . . . . . . . . . . . 82
5.4.1. Audio Session - Voice Activity Detection . . . . . . 82
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