Diff: draft-ietf-rtcweb-sdp-09.txt - draft-ietf-rtcweb-sdp-10.txt

	draft-ietf-rtcweb-sdp-09.txt		draft-ietf-rtcweb-sdp-10.txt

	Network Working Group S. Nandakumar		Network Working Group S. Nandakumar
	Internet-Draft C. Jennings		Internet-Draft C. Jennings
	Intended status: Informational Cisco		Intended status: Informational Cisco

	Expires: September 3, 2018 March 2, 2018		Expires: January 1, 2019 June 30, 2018

	Annotated Example SDP for WebRTC		Annotated Example SDP for WebRTC

	draft-ietf-rtcweb-sdp-09		draft-ietf-rtcweb-sdp-10

	Abstract		Abstract

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

	skipping to change at page 1, line 40 ¶		skipping to change at page 1, line 40 ¶
	Internet-Drafts are working documents of the Internet Engineering		Internet-Drafts are working documents of the Internet Engineering
	Task Force (IETF). Note that other groups may also distribute		Task Force (IETF). Note that other groups may also distribute
	working documents as Internet-Drafts. The list of current Internet-		working documents as Internet-Drafts. The list of current Internet-
	Drafts is at http://datatracker.ietf.org/drafts/current/.		Drafts is at http://datatracker.ietf.org/drafts/current/.

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


	This Internet-Draft will expire on September 3, 2018.		This Internet-Draft will expire on January 1, 2019.

	Copyright Notice		Copyright Notice

	Copyright (c) 2018 IETF Trust and the persons identified as the		Copyright (c) 2018 IETF Trust and the persons identified as the
	document authors. All rights reserved.		document authors. All rights reserved.

	This document is subject to BCP 78 and the IETF Trust's Legal		This document is subject to BCP 78 and the IETF Trust's Legal
	Provisions Relating to IETF Documents		Provisions Relating to IETF Documents
	(http://trustee.ietf.org/license-info) in effect on the date of		(http://trustee.ietf.org/license-info) in effect on the date of
	publication of this document. Please review these documents		publication of this document. Please review these documents

	skipping to change at page 3, line 6 ¶		skipping to change at page 3, line 6 ¶
	5.4.2. Audio Conference - Voice Activity Detection . . . . . 96		5.4.2. Audio Conference - Voice Activity Detection . . . . . 96
	5.4.3. Successful legacy Interop Fallback with bundle-only . 99		5.4.3. Successful legacy Interop Fallback with bundle-only . 99
	5.4.4. Legacy Interop with RTP/AVP profile . . . . . . . . . 104		5.4.4. Legacy Interop with RTP/AVP profile . . . . . . . . . 104
	6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 108		6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 108
	7. Security Considerations . . . . . . . . . . . . . . . . . . . 108		7. Security Considerations . . . . . . . . . . . . . . . . . . . 108
	8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 108		8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 108
	9. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . 108		9. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . 108
	10. Informative References . . . . . . . . . . . . . . . . . . . 112		10. Informative References . . . . . . . . . . . . . . . . . . . 112
	Appendix A. Appendix . . . . . . . . . . . . . . . . . . . . . . 116		Appendix A. Appendix . . . . . . . . . . . . . . . . . . . . . . 116
	A.1. JSEP SDP Attributes Checklist . . . . . . . . . . . . . . 116		A.1. JSEP SDP Attributes Checklist . . . . . . . . . . . . . . 116

	A.1.1. Common Checklist . . . . . . . . . . . . . . . . . . 116		A.1.1. Common Checklist . . . . . . . . . . . . . . . . . . 117
	A.1.2. RTP Media Description Checklist . . . . . . . . . . . 117		A.1.2. RTP Media Description Checklist . . . . . . . . . . . 117
	A.1.3. DataChannel Media Description checklist . . . . . . . 119		A.1.3. DataChannel Media Description checklist . . . . . . . 119
	Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 119		Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 119

	1. Introduction		1. Introduction

	Javascript Session Establishment Protocol(JSEP)		Javascript Session Establishment Protocol(JSEP)
	[I-D.ietf-rtcweb-jsep] specifies a generic protocol needed to		[I-D.ietf-rtcweb-jsep] specifies a generic protocol needed to
	generate [RFC3264] Offers and Answers negotiated between the [WebRTC]		generate [RFC3264] Offers and Answers negotiated between the [WebRTC]
	peers for setting up, updating and tearing down a WebRTC session.		peers for setting up, updating and tearing down a WebRTC session.

	skipping to change at page 95, line 10 ¶		skipping to change at page 95, line 10 ¶
	\| o=- 16833 0 IN IP4 0.0.0.0 \| [RFC4566] \|		\| o=- 16833 0 IN IP4 0.0.0.0 \| [RFC4566] \|
	\| s=- \| [RFC4566] \|		\| s=- \| [RFC4566] \|
	\| t=0 0 \| [RFC4566] \|		\| t=0 0 \| [RFC4566] \|
	\| a=group:BUNDLE audio \| [I-D.ietf-mmusic-sd \|		\| a=group:BUNDLE audio \| [I-D.ietf-mmusic-sd \|
	\| \| p-bundle-negotiatio \|		\| \| p-bundle-negotiatio \|
	\| \| n] \|		\| \| n] \|
	\| a=ice-options:trickle \| [I-D.ietf-mmusic-tr \|		\| a=ice-options:trickle \| [I-D.ietf-mmusic-tr \|
	\| \| ickle-ice] \|		\| \| ickle-ice] \|
	\| **** Audio m=line ***** \| ***************** \|		\| **** Audio m=line ***** \| ***************** \|
	\| \| ********** \|		\| \| ********** \|

	\| m=audio 49203 UDP/TLS/RTP/SAVPF 109 0 98 \| [RFC4566] \|		\| m=audio 49203 UDP/TLS/RTP/SAVPF 109 0 8 \| [RFC4566] \|
	\| c=IN IP4 203.0.113.77 \| [RFC4566] \|		\| c=IN IP4 203.0.113.77 \| [RFC4566] \|
	\| a=mid:audio \| [RFC5888] \|		\| a=mid:audio \| [RFC5888] \|
	\| a=msid:ma ta \| Identifies \|		\| a=msid:ma ta \| Identifies \|
	\| \| RTCMediaStream ID \|		\| \| RTCMediaStream ID \|
	\| \| (ma) and \|		\| \| (ma) and \|
	\| \| RTCMediaStreamTrack \|		\| \| RTCMediaStreamTrack \|
	\| \| ID (ta) \|		\| \| ID (ta) \|
	\| a=sendrecv \| [RFC3264] - Bob can \|		\| a=sendrecv \| [RFC3264] - Bob can \|
	\| \| send and recv audio \|		\| \| send and recv audio \|
	\| a=rtpmap:109 opus/48000/2 \| [RFC7587] - Bob \|		\| a=rtpmap:109 opus/48000/2 \| [RFC7587] - Bob \|
	\| \| accepts only Opus \|		\| \| accepts only Opus \|
	\| \| Codec \|		\| \| Codec \|
	\| a=rtpmap:0 PCMU/8000 \| [RFC3551] PCMU \|		\| a=rtpmap:0 PCMU/8000 \| [RFC3551] PCMU \|
	\| \| Audio Codec \|		\| \| Audio Codec \|

	\| a=rtpmap:0 PCMA/8000 \| [RFC3551] PCMA \|		\| a=rtpmap:8 PCMA/8000 \| [RFC3551] PCMA \|
	\| \| Audio Codec \|		\| \| Audio Codec \|
	\| a=maxptime:120 \| [RFC4566] \|		\| a=maxptime:120 \| [RFC4566] \|
	\| a=ice-ufrag:c300d85b \| [RFC5245] \|		\| a=ice-ufrag:c300d85b \| [RFC5245] \|
	\| a=ice-pwd:de4e99bd291c325921d5d47efbabd9a2 \| [RFC5245] \|		\| a=ice-pwd:de4e99bd291c325921d5d47efbabd9a2 \| [RFC5245] \|
	\| a=fingerprint:sha-256 6B:8B:F0:65:5F:78:E2: \| [RFC5245] \|		\| a=fingerprint:sha-256 6B:8B:F0:65:5F:78:E2: \| [RFC5245] \|
	\| 51:3B:AC:6F:F3:3F:46:1B:35:DC:B8:5F:64:1A:2 \| \|		\| 51:3B:AC:6F:F3:3F:46:1B:35:DC:B8:5F:64:1A:2 \| \|
	\| 4:C2:43:F0:A1:58:D0:A1:2C:19:08 \| \|		\| 4:C2:43:F0:A1:58:D0:A1:2C:19:08 \| \|
	\| a=setup:active \| [RFC5763] \|		\| a=setup:active \| [RFC5763] \|
	\| a=tls-id:CJ6FF9ZZMJW7MDRJIR7XVIQM48GE1G31 \| [I-D.ietf-mmusic-dt \|		\| a=tls-id:CJ6FF9ZZMJW7MDRJIR7XVIQM48GE1G31 \| [I-D.ietf-mmusic-dt \|
	\| \| ls-sdp] \|		\| \| ls-sdp] \|

	skipping to change at page 97, line 26 ¶		skipping to change at page 97, line 26 ¶
	\| \| RTCMediaStream ID \|		\| \| RTCMediaStream ID \|
	\| \| (ma) and \|		\| \| (ma) and \|
	\| \| RTCMediaStreamTrack \|		\| \| RTCMediaStreamTrack \|
	\| \| ID (ta) \|		\| \| ID (ta) \|
	\| a=sendrecv \| [RFC3264] - Alice \|		\| a=sendrecv \| [RFC3264] - Alice \|
	\| \| can send and recv \|		\| \| can send and recv \|
	\| \| audio \|		\| \| audio \|
	\| a=rtpmap:109 opus/48000/2 \| [RFC7587] \|		\| a=rtpmap:109 opus/48000/2 \| [RFC7587] \|
	\| a=rtpmap:0 PCMU/8000 \| [RFC3551] PCMU \|		\| a=rtpmap:0 PCMU/8000 \| [RFC3551] PCMU \|
	\| \| Audio Codec \|		\| \| Audio Codec \|

	\| a=rtpmap:0 PCMA/8000 \| [RFC3551] PCMA \|		\| a=rtpmap:8 PCMA/8000 \| [RFC3551] PCMA \|
	\| \| Audio Codec \|		\| \| Audio Codec \|
	\| a=maxptime:120 \| [RFC4566] \|		\| a=maxptime:120 \| [RFC4566] \|
	\| a=ice-ufrag:074c6550 \| [RFC5245] \|		\| a=ice-ufrag:074c6550 \| [RFC5245] \|
	\| a=ice-pwd:a28a397a4c3f31747d1ee3474af08a068 \| [RFC5245] \|		\| a=ice-pwd:a28a397a4c3f31747d1ee3474af08a068 \| [RFC5245] \|
	\| a=fingerprint:sha-256 19:E2:1C:3B:4B:9F:81: \| [RFC5245] \|		\| a=fingerprint:sha-256 19:E2:1C:3B:4B:9F:81: \| [RFC5245] \|
	\| E6:B8:5C:F4:A5:A8:D8:73:04:BB:05:2F:70:9F:0 \| \|		\| E6:B8:5C:F4:A5:A8:D8:73:04:BB:05:2F:70:9F:0 \| \|
	\| 4:A9:0E:05:E9:26:33:E8:70:88:A2 \| \|		\| 4:A9:0E:05:E9:26:33:E8:70:88:A2 \| \|
	\| a=setup:actpass \| [RFC5763] \|		\| a=setup:actpass \| [RFC5763] \|
	\| a=tls-id:89J2LRATQ3ULA24G9AHWVR31VJWSLB68 \| [I-D.ietf-mmusic-dt \|		\| a=tls-id:89J2LRATQ3ULA24G9AHWVR31VJWSLB68 \| [I-D.ietf-mmusic-dt \|
	\| \| ls-sdp] \|		\| \| ls-sdp] \|

	skipping to change at page 98, line 24 ¶		skipping to change at page 98, line 24 ¶
	\| \| Origin Information \|		\| \| Origin Information \|
	\| s=- \| [RFC4566] \|		\| s=- \| [RFC4566] \|
	\| t=0 0 \| [RFC4566] \|		\| t=0 0 \| [RFC4566] \|
	\| a=group:BUNDLE audio \| [I-D.ietf-mmusic-sd \|		\| a=group:BUNDLE audio \| [I-D.ietf-mmusic-sd \|
	\| \| p-bundle-negotiatio \|		\| \| p-bundle-negotiatio \|
	\| \| n] \|		\| \| n] \|
	\| a=ice-options:trickle \| [I-D.ietf-mmusic-tr \|		\| a=ice-options:trickle \| [I-D.ietf-mmusic-tr \|
	\| \| ickle-ice] \|		\| \| ickle-ice] \|
	\| **** Audio m=line ***** \| ***************** \|		\| **** Audio m=line ***** \| ***************** \|
	\| \| ********** \|		\| \| ********** \|

	\| m=audio 49203 UDP/TLS/RTP/SAVPF 109 0 98 \| [RFC4566] \|		\| m=audio 49203 UDP/TLS/RTP/SAVPF 109 0 8 \| [RFC4566] \|
	\| c=IN IP4 203.0.113.77 \| [RFC4566] \|		\| c=IN IP4 203.0.113.77 \| [RFC4566] \|
	\| a=mid:audio \| [RFC5888] \|		\| a=mid:audio \| [RFC5888] \|
	\| a=msid:ma ta \| Identifies \|		\| a=msid:ma ta \| Identifies \|
	\| \| RTCMediaStream ID \|		\| \| RTCMediaStream ID \|
	\| \| (ma) and \|		\| \| (ma) and \|
	\| \| RTCMediaStreamTrack \|		\| \| RTCMediaStreamTrack \|
	\| \| ID (ta) \|		\| \| ID (ta) \|
	\| a=sendrecv \| [RFC3264] \|		\| a=sendrecv \| [RFC3264] \|
	\| a=rtpmap:109 opus/48000/2 \| [RFC7587] \|		\| a=rtpmap:109 opus/48000/2 \| [RFC7587] \|
	\| a=rtpmap:0 PCMU/8000 \| [RFC3551] PCMU \|		\| a=rtpmap:0 PCMU/8000 \| [RFC3551] PCMU \|
	\| \| Audio Codec \|		\| \| Audio Codec \|

	\| a=rtpmap:0 PCMA/8000 \| [RFC3551] PCMA \|		\| a=rtpmap:8 PCMA/8000 \| [RFC3551] PCMA \|
	\| \| Audio Codec \|		\| \| Audio Codec \|
	\| a=maxptime:120 \| [RFC4566] \|		\| a=maxptime:120 \| [RFC4566] \|
	\| a=ice-ufrag:c300d85b \| [RFC5245] \|		\| a=ice-ufrag:c300d85b \| [RFC5245] \|
	\| a=ice-pwd:de4e99bd291c325921d5d47efbabd9a2 \| [RFC5245] \|		\| a=ice-pwd:de4e99bd291c325921d5d47efbabd9a2 \| [RFC5245] \|
	\| a=fingerprint:sha-256 6B:8B:F0:65:5F:78:E2: \| [RFC5245] \|		\| a=fingerprint:sha-256 6B:8B:F0:65:5F:78:E2: \| [RFC5245] \|
	\| 51:3B:AC:6F:F3:3F:46:1B:35:DC:B8:5F:64:1A:2 \| \|		\| 51:3B:AC:6F:F3:3F:46:1B:35:DC:B8:5F:64:1A:2 \| \|
	\| 4:C2:43:F0:A1:58:D0:A1:2C:19:08 \| \|		\| 4:C2:43:F0:A1:58:D0:A1:2C:19:08 \| \|
	\| a=setup:active \| [RFC5763] \|		\| a=setup:active \| [RFC5763] \|
	\| a=tls-id:CJ6FF9ZZMJW7MDRJIR7XVIQM48GE1G31 \| [I-D.ietf-mmusic-dt \|		\| a=tls-id:CJ6FF9ZZMJW7MDRJIR7XVIQM48GE1G31 \| [I-D.ietf-mmusic-dt \|
	\| \| ls-sdp] \|		\| \| ls-sdp] \|

	skipping to change at page 99, line 30 ¶		skipping to change at page 99, line 30 ¶

	In the scenario described below, Alice is a multi-stream capable		In the scenario described below, Alice is a multi-stream capable
	WebRTC endpoint while Bob is a legacy VOIP end-point. The SDP Offer/		WebRTC endpoint while Bob is a legacy VOIP end-point. The SDP Offer/
	Answer exchange demonstrates successful session setup with fallback		Answer exchange demonstrates successful session setup with fallback
	to audio only stream negotiated via bundle-only framework between the		to audio only stream negotiated via bundle-only framework between the
	end-points. Specifically,		end-points. Specifically,

	o Offer from Alice describes 2 cameras via 2 video m=lines with both		o Offer from Alice describes 2 cameras via 2 video m=lines with both
	marked as bundle-only.		marked as bundle-only.


	o Since Bob doesnot recognize either the BUNDLE mechanism or the		o Bob doesn't recognize BUNDLE mechanism and since Alice has marked
	bundle-only attribute, he accepts only the audio stream from		both the video m=lines with port 0, Bob accepts just the audio
	Alice.		stream from Alice.

	NOTE: Since Alice is unaware of Bob's support for BUNDLE framework,		NOTE: Since Alice is unaware of Bob's support for BUNDLE framework,

	Alice ensures to include separate RTP/RTCP ports and candidate		Alice includes separate RTP/RTCP ports and candidate information.
	information.

	Successful 2-Way WebRTC <-> VOIP Interop		Successful 2-Way WebRTC <-> VOIP Interop

	Alice Bob		Alice Bob
	\| \|		\| \|
	\| \|		\| \|
	\| Alice is a multistream capable WebRTC end-point \|		\| Alice is a multistream capable WebRTC end-point \|
	\| & Bob is behind a legacy VOIP system \|		\| & Bob is behind a legacy VOIP system \|
	\| \|		\| \|

	\|Offer(Audio:Opus Video:2 VP8,2 H2.64 Streams) with \|		\|Offer(Audio:Opus Video:2 VP8,2 H.264 Streams) with \|
	\| bundle-only \|		\| bundle-only \|
	\|---------------------------------------------------------->\|		\|---------------------------------------------------------->\|
	\| Alice marks both the video streams as bundle-only \|		\| Alice marks both the video streams as bundle-only \|
	\| \|		\| \|
	\| \|		\| \|
	\| Answer(Audio:Opus) \|		\| Answer(Audio:Opus) \|
	\|<----------------------------------------------------------\|		\|<----------------------------------------------------------\|
	\| \|Bob		\| \|Bob
	\| \|accepts		\| \|accepts
	\| \|audio		\| \|audio

	skipping to change at page 101, line 46 ¶		skipping to change at page 101, line 46 ¶
	\| 61665 typ host \| \|		\| 61665 typ host \| \|
	\| a=candidate:1 1 UDP 694302207 203.0.113.141 \| [RFC5245] \|		\| a=candidate:1 1 UDP 694302207 203.0.113.141 \| [RFC5245] \|
	\| 54609 typ srflx raddr 192.0.2.4 rport 61665 \| \|		\| 54609 typ srflx raddr 192.0.2.4 rport 61665 \| \|
	\| a=candidate:0 1 UDP 2113667326 192.0.2.4 \| [RFC5245] \|		\| a=candidate:0 1 UDP 2113667326 192.0.2.4 \| [RFC5245] \|
	\| 61667 typ host \| \|		\| 61667 typ host \| \|
	\| a=candidate:1 1 UDP 1694302206 \| [RFC5245] \|		\| a=candidate:1 1 UDP 1694302206 \| [RFC5245] \|
	\| 203.0.113.141 64678 typ srflx raddr \| \|		\| 203.0.113.141 64678 typ srflx raddr \| \|
	\| 192.0.2.4 rport 61667 \| \|		\| 192.0.2.4 rport 61667 \| \|
	\| **** Video-1 m=line ***** \| ***************** \|		\| **** Video-1 m=line ***** \| ***************** \|
	\| \| ********** \|		\| \| ********** \|

	\| m=video 0 UDP/TLS/RTP/SAVPF 98 100 \| bundle-only video \|		\| m=video 0 UDP/TLS/RTP/SAVPF 98 \| bundle-only video \|
	\| \| line with port \|		\| \| line with port \|
	\| \| number set to zero \|		\| \| number set to zero \|
	\| c=IN IP4 203.0.113.141 \| [RFC4566] \|		\| c=IN IP4 203.0.113.141 \| [RFC4566] \|
	\| a=bundle-only \| [I-D.ietf-mmusic-sd \|		\| a=bundle-only \| [I-D.ietf-mmusic-sd \|
	\| \| p-bundle-negotiatio \|		\| \| p-bundle-negotiatio \|
	\| \| n] \|		\| \| n] \|
	\| a=mid:m1 \| [RFC5888] Video \|		\| a=mid:m1 \| [RFC5888] Video \|
	\| \| m=line part of \|		\| \| m=line part of \|
	\| \| BUNDLE group \|		\| \| BUNDLE group \|
	\| a=msid:ma tb \| Identifies \|		\| a=msid:ma tb \| Identifies \|

	skipping to change at page 104, line 19 ¶		skipping to change at page 104, line 19 ¶
	\| \| m=line is \|		\| \| m=line is \|
	\| \| rejected \|		\| \| rejected \|
	\| \| implicitly due \|		\| \| implicitly due \|
	\| \| to port 0 \|		\| \| to port 0 \|
	+-------------------------------------------------+-----------------+		+-------------------------------------------------+-----------------+

	Table 42: 5.4.3 SDP Answer		Table 42: 5.4.3 SDP Answer

	5.4.4. Legacy Interop with RTP/AVP profile		5.4.4. Legacy Interop with RTP/AVP profile


	In the scenario desribed below, Alice is a legacy end-point which		In the scenario described below, Alice is a legacy end-point which
	sends [RFC3264] Offer with RTP/AVP based audio and video descriptions		sends [RFC3264] Offer with RTP/AVP based audio and video descriptions
	along with DTLS fingerprint and RTCP feedback information.		along with DTLS fingerprint and RTCP feedback information.


	On the other hand, Bob being a WebRTC end-point follows the		On the other hand, Bob being a WebRTC end-point follows procedures in
	procedures in section 5.1.2 of [I-D.ietf-rtcweb-jsep] and accepts the		section 5.1.2 of [I-D.ietf-rtcweb-jsep] and accepts the Alice's offer
	Alice's offer for DTLS-SRTP based session with RTCP feedback.		for DTLS-SRTP based session with RTCP feedback.

	Successful 2-Way WebRTC <-> VOIP Interop		Successful 2-Way WebRTC <-> VOIP Interop

	Alice Bob		Alice Bob
	\| \|		\| \|
	\| \|		\| \|
	\|Alice is a legacy VOIP End-point & Bob is a WebRTC End-Point\|		\|Alice is a legacy VOIP End-point & Bob is a WebRTC End-Point\|
	\| \|		\| \|
	\| \|		\| \|
	\| \|		\| \|

	skipping to change at page 105, line 33 ¶		skipping to change at page 105, line 33 ¶
	\|<-----------------------------------------------------------\|		\|<-----------------------------------------------------------\|
	\| \|Bob		\| \|Bob
	\| \|accepts		\| \|accepts
	\| \|"legacy		\| \|"legacy
	\| \|compliant"		\| \|compliant"
	\| \|m=line		\| \|m=line
	\| \|		\| \|
	\| \|		\| \|
	\| Two way Opus Audio, H.264 Video \|		\| Two way Opus Audio, H.264 Video \|
	\|............................................................\|		\|............................................................\|

	\| Session also suports RTP/RTCP Mux, RTCP Feedback \|		\| Session also supports RTP/RTCP Mux, RTCP Feedback \|
	\| \|		\| \|

	+-------------------------------------------------+-----------------+		+-------------------------------------------------+-----------------+
	\| Offer SDP Contents \| RFC#/Notes \|		\| Offer SDP Contents \| RFC#/Notes \|
	+-------------------------------------------------+-----------------+		+-------------------------------------------------+-----------------+
	\| v=0 \| [RFC4566] \|		\| v=0 \| [RFC4566] \|
	\| o=- 20518 0 IN IP4 0.0.0.0 \| [RFC4566] \|		\| o=- 20518 0 IN IP4 0.0.0.0 \| [RFC4566] \|
	\| s=- \| [RFC4566] \|		\| s=- \| [RFC4566] \|
	\| t=0 0 \| [RFC4566] \|		\| t=0 0 \| [RFC4566] \|
	\| a=ice-ufrag:074c6550 \| [RFC5245] \|		\| a=ice-ufrag:074c6550 \| [RFC5245] \|

	skipping to change at page 107, line 44 ¶		skipping to change at page 107, line 44 ¶
	\| a=fingerprint:sha-256 BB:05:2F:70:9F:04:A9:0E:0 \| [RFC5245] \|		\| a=fingerprint:sha-256 BB:05:2F:70:9F:04:A9:0E:0 \| [RFC5245] \|
	\| 5:E9:26:33:E8:70:88:A2:19:E2:1C:3B:4B:9F:81:E6: \| \|		\| 5:E9:26:33:E8:70:88:A2:19:E2:1C:3B:4B:9F:81:E6: \| \|
	\| B8:5C:F4:A5:A8:D8:73:04 \| \|		\| B8:5C:F4:A5:A8:D8:73:04 \| \|
	\| a=rtcp-mux \| [RFC5761] \|		\| a=rtcp-mux \| [RFC5761] \|
	\| a=candidate:0 1 UDP 2113667327 198.51.100.7 \| [RFC5245] \|		\| a=candidate:0 1 UDP 2113667327 198.51.100.7 \| [RFC5245] \|
	\| 49203 typ host \| \|		\| 49203 typ host \| \|
	\| a=candidate:1 1 UDP 1694302207 203.0.113.77 \| [RFC5245] \|		\| a=candidate:1 1 UDP 1694302207 203.0.113.77 \| [RFC5245] \|
	\| 49203 typ srflx raddr 198.51.100.7 rport 49203 \| \|		\| 49203 typ srflx raddr 198.51.100.7 rport 49203 \| \|
	\| **** Video m=line ***** \| ************* \|		\| **** Video m=line ***** \| ************* \|
	\| \| ************** \|		\| \| ************** \|

	\| m=video 63130 RTP/SAVP 120 \| [RFC4566] Bob \|		\| m=video 63130 RTP/AVP 120 \| [RFC4566] Bob \|
	\| \| accepts RTP/AVP \|		\| \| accepts RTP/AVP \|
	\| \| based video \|		\| \| based video \|
	\| \| stram \|		\| \| stram \|
	\| c=IN IP4 203.0.113.77 \| [RFC4566] \|		\| c=IN IP4 203.0.113.77 \| [RFC4566] \|
	\| a=rtpmap:120 VP8/90000 \| [RFC7741] \|		\| a=rtpmap:120 VP8/90000 \| [RFC7741] \|
	\| a=sendrecv \| [RFC3264] \|		\| a=sendrecv \| [RFC3264] \|
	\| a=ice-ufrag:e39091na \| [RFC5245] \|		\| a=ice-ufrag:e39091na \| [RFC5245] \|
	\| a=ice-pwd:dbc325921d5dd29e4e99147efbabd9a2 \| [RFC5245] \|		\| a=ice-pwd:dbc325921d5dd29e4e99147efbabd9a2 \| [RFC5245] \|
	\| a=fingerprint:sha-256 BB:0A:0E:05:E9:26:33:E8:7 \| [RFC5245] \|		\| a=fingerprint:sha-256 BB:0A:0E:05:E9:26:33:E8:7 \| [RFC5245] \|
	\| 0:88:A2:2F:70:9F:04:19:E2:1C:3B:4B:9F:81:56:2F: \| \|		\| 0:88:A2:2F:70:9F:04:19:E2:1C:3B:4B:9F:81:56:2F: \| \|

	skipping to change at page 108, line 39 ¶		skipping to change at page 108, line 39 ¶

	In addition, since the SDP offer and answer messages can contain		In addition, since the SDP offer and answer messages can contain
	private information about addresses and sessions to be established		private information about addresses and sessions to be established
	between parties, if this information needs to be kept private, some		between parties, if this information needs to be kept private, some
	security mechanism (using TLS transport for example) in the protocol		security mechanism (using TLS transport for example) in the protocol
	used to carry the offers and answers must be used.		used to carry the offers and answers must be used.

	8. Acknowledgments		8. Acknowledgments

	We would like to thank Justin Uberti, Chris Flo, Paul Kyzivat, Nils		We would like to thank Justin Uberti, Chris Flo, Paul Kyzivat, Nils

	Ohlmeier for their detailed review and inputs. Thanks to Adam Roach		Ohlmeier, Flemming Andreason, for their detailed review and inputs.
	for providing syntax validation script to help highlight syntax and		Thanks to Adam Roach for providing syntax validation script to help
	formatting errors.		highlight syntax and formatting errors.

	9. Change Log		9. Change Log

	[RFC EDITOR NOTE: Please remove this section when publishing]		[RFC EDITOR NOTE: Please remove this section when publishing]


			Changes from draft-ietf-rtcweb-sdp-09

			o Review feedback incorporated from Flemming Andreason in
			Section 5.4

	Changes from draft-ietf-rtcweb-sdp-08		Changes from draft-ietf-rtcweb-sdp-08


	o Fixed formatting and syntax issues pointed out by Adam Roach's		o Fixed formatting and syntax issues pointed out by Adam Roach's
	validator script. List of issues are here:		validator script. List of issues are here:
	https://github.com/fluffy/ietf/issues?q=is%3Aissue+is%3Aclosed		https://github.com/fluffy/ietf/issues?q=is%3Aissue+is%3Aclosed

	o Align examples to match latest bundle specification as pointed by		o Align examples to match latest bundle specification as pointed by
	Christer Holmberg		Christer Holmberg

	Changes from draft-ietf-rtcweb-sdp-07		Changes from draft-ietf-rtcweb-sdp-07

	o Incorporate review from Nils.		o Incorporate review from Nils.

	skipping to change at page 114, line 52 ¶		skipping to change at page 115, line 9 ¶

	[RFC7826] Schulzrinne, H., Rao, A., Lanphier, R., Westerlund, M.,		[RFC7826] Schulzrinne, H., Rao, A., Lanphier, R., Westerlund, M.,
	and M. Stiemerling, Ed., "Real-Time Streaming Protocol		and M. Stiemerling, Ed., "Real-Time Streaming Protocol
	Version 2.0", RFC 7826, DOI 10.17487/RFC7826, December		Version 2.0", RFC 7826, DOI 10.17487/RFC7826, December
	2016, <https://www.rfc-editor.org/info/rfc7826>.		2016, <https://www.rfc-editor.org/info/rfc7826>.

	[I-D.ietf-mmusic-sdp-bundle-negotiation]		[I-D.ietf-mmusic-sdp-bundle-negotiation]
	Holmberg, C., Alvestrand, H., and C. Jennings,		Holmberg, C., Alvestrand, H., and C. Jennings,
	"Negotiating Media Multiplexing Using the Session		"Negotiating Media Multiplexing Using the Session
	Description Protocol (SDP)", draft-ietf-mmusic-sdp-bundle-		Description Protocol (SDP)", draft-ietf-mmusic-sdp-bundle-

	negotiation-48 (work in progress), January 2018.		negotiation-52 (work in progress), May 2018.

	[I-D.ietf-mmusic-sdp-simulcast]		[I-D.ietf-mmusic-sdp-simulcast]
	Burman, B., Westerlund, M., Nandakumar, S., and M. Zanaty,		Burman, B., Westerlund, M., Nandakumar, S., and M. Zanaty,
	"Using Simulcast in SDP and RTP Sessions", draft-ietf-		"Using Simulcast in SDP and RTP Sessions", draft-ietf-

	mmusic-sdp-simulcast-11 (work in progress), December 2017.		mmusic-sdp-simulcast-13 (work in progress), June 2018.

	[I-D.ietf-mmusic-rid]		[I-D.ietf-mmusic-rid]
	Roach, A., "RTP Payload Format Restrictions", draft-ietf-		Roach, A., "RTP Payload Format Restrictions", draft-ietf-

	mmusic-rid-14 (work in progress), February 2018.		mmusic-rid-15 (work in progress), May 2018.

	[I-D.ietf-rtcweb-jsep]		[I-D.ietf-rtcweb-jsep]
	Uberti, J., Jennings, C., and E. Rescorla, "JavaScript		Uberti, J., Jennings, C., and E. Rescorla, "JavaScript
	Session Establishment Protocol", draft-ietf-rtcweb-jsep-24		Session Establishment Protocol", draft-ietf-rtcweb-jsep-24
	(work in progress), October 2017.		(work in progress), October 2017.

	[I-D.ietf-mmusic-trickle-ice]		[I-D.ietf-mmusic-trickle-ice]
	Ivov, E., Rescorla, E., and J. Uberti, "Trickle ICE:		Ivov, E., Rescorla, E., and J. Uberti, "Trickle ICE:
	Incremental Provisioning of Candidates for the Interactive		Incremental Provisioning of Candidates for the Interactive
	Connectivity Establishment (ICE) Protocol", draft-ietf-		Connectivity Establishment (ICE) Protocol", draft-ietf-

	skipping to change at page 115, line 44 ¶		skipping to change at page 116, line 6 ¶
	over Datagram Transport Layer Security (DTLS) Transport.",		over Datagram Transport Layer Security (DTLS) Transport.",
	draft-ietf-mmusic-sctp-sdp-26 (work in progress), April		draft-ietf-mmusic-sctp-sdp-26 (work in progress), April
	2017.		2017.

	[I-D.ietf-rtcweb-data-channel]		[I-D.ietf-rtcweb-data-channel]
	Jesup, R., Loreto, S., and M. Tuexen, "WebRTC Data		Jesup, R., Loreto, S., and M. Tuexen, "WebRTC Data
	Channels", draft-ietf-rtcweb-data-channel-13 (work in		Channels", draft-ietf-rtcweb-data-channel-13 (work in
	progress), January 2015.		progress), January 2015.

	[I-D.ietf-payload-flexible-fec-scheme]		[I-D.ietf-payload-flexible-fec-scheme]

	Singh, V., Begen, A., Zanaty, M., and G. Mandyam, "RTP		Zanaty, M., Singh, V., Begen, A., and G. Mandyam, "RTP
	Payload Format for Flexible Forward Error Correction		Payload Format for Flexible Forward Error Correction

	(FEC)", draft-ietf-payload-flexible-fec-scheme-05 (work in		(FEC)", draft-ietf-payload-flexible-fec-scheme-07 (work in
	progress), July 2017.		progress), March 2018.

	[I-D.ietf-mmusic-mux-exclusive]		[I-D.ietf-mmusic-mux-exclusive]
	Holmberg, C., "Indicating Exclusive Support of RTP/RTCP		Holmberg, C., "Indicating Exclusive Support of RTP/RTCP
	Multiplexing using SDP", draft-ietf-mmusic-mux-		Multiplexing using SDP", draft-ietf-mmusic-mux-
	exclusive-12 (work in progress), May 2017.		exclusive-12 (work in progress), May 2017.

	[I-D.ietf-mmusic-dtls-sdp]		[I-D.ietf-mmusic-dtls-sdp]
	Holmberg, C. and R. Shpount, "Session Description Protocol		Holmberg, C. and R. Shpount, "Session Description Protocol
	(SDP) Offer/Answer Considerations for Datagram Transport		(SDP) Offer/Answer Considerations for Datagram Transport
	Layer Security (DTLS) and Transport Layer Security (TLS)",		Layer Security (DTLS) and Transport Layer Security (TLS)",
	draft-ietf-mmusic-dtls-sdp-32 (work in progress), October		draft-ietf-mmusic-dtls-sdp-32 (work in progress), October
	2017.		2017.

	[I-D.ietf-rtcweb-security-arch]		[I-D.ietf-rtcweb-security-arch]
	Rescorla, E., "WebRTC Security Architecture", draft-ietf-		Rescorla, E., "WebRTC Security Architecture", draft-ietf-

	rtcweb-security-arch-13 (work in progress), October 2017.		rtcweb-security-arch-14 (work in progress), March 2018.

	[I-D.ietf-rtcweb-security]		[I-D.ietf-rtcweb-security]
	Rescorla, E., "Security Considerations for WebRTC", draft-		Rescorla, E., "Security Considerations for WebRTC", draft-
	ietf-rtcweb-security-10 (work in progress), January 2018.		ietf-rtcweb-security-10 (work in progress), January 2018.

	[I-D.ietf-avtext-rid]		[I-D.ietf-avtext-rid]
	Roach, A., Nandakumar, S., and P. Thatcher, "RTP Stream		Roach, A., Nandakumar, S., and P. Thatcher, "RTP Stream
	Identifier Source Description (SDES)", draft-ietf-avtext-		Identifier Source Description (SDES)", draft-ietf-avtext-
	rid-09 (work in progress), October 2016.		rid-09 (work in progress), October 2016.


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