draft-ietf-mmusic-sdp-mux-attributes-14.txt		draft-ietf-mmusic-sdp-mux-attributes-15.txt
	Network Working Group S. Nandakumar		Network Working Group S. Nandakumar
	Internet-Draft Cisco		Internet-Draft Cisco
	Intended status: Standards Track September 22, 2016		Intended status: Standards Track December 16, 2016
	Expires: March 26, 2017		Expires: June 19, 2017
	A Framework for SDP Attributes when Multiplexing		A Framework for SDP Attributes when Multiplexing
	draft-ietf-mmusic-sdp-mux-attributes-14		draft-ietf-mmusic-sdp-mux-attributes-15
	Abstract		Abstract
	The purpose of this specification is to provide a framework for		The purpose of this specification is to provide a framework for
	analyzing the multiplexing characteristics of Session Description		analyzing the multiplexing characteristics of Session Description
	Protocol (SDP) attributes when SDP is used to negotiate the usage of		Protocol (SDP) attributes when SDP is used to negotiate the usage of
	single 5-tuple for sending and receiving media associated with		single 5-tuple for sending and receiving media associated with
	multiple media descriptions.		multiple media descriptions.
	This specification also categorizes the existing SDP attributes based		This specification also categorizes the existing SDP attributes based
	skipping to change at page 1, line 37 ¶		skipping to change at page 1, line 37 ¶
	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 March 26, 2017.		This Internet-Draft will expire on June 19, 2017.
	Copyright Notice		Copyright Notice
	Copyright (c) 2016 IETF Trust and the persons identified as the		Copyright (c) 2016 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 4, line 36 ¶		skipping to change at page 4, line 36 ¶
	14.2.1.2. Example: Attribute Capability Multiplexing . . . 68		14.2.1.2. Example: Attribute Capability Multiplexing . . . 68
	14.3. RFC6871 Analysis . . . . . . . . . . . . . . . . . . . . 69		14.3. RFC6871 Analysis . . . . . . . . . . . . . . . . . . . . 69
	14.3.1. Recommendation: Dealing with Payload Type Numbers . 69		14.3.1. Recommendation: Dealing with Payload Type Numbers . 69
	14.3.1.1. Example: Attribute Capability Under Shared		14.3.1.1. Example: Attribute Capability Under Shared
	Payload Type . . . . . . . . . . . . . . . . . . 69		Payload Type . . . . . . . . . . . . . . . . . . 69
	14.3.2. Recommendation: Dealing with Latent Configurations . 70		14.3.2. Recommendation: Dealing with Latent Configurations . 70
	15. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 71		15. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 71
	15.1. New 'Multiplexing Categories' subregistry . . . . . . . 71		15.1. New 'Multiplexing Categories' subregistry . . . . . . . 71
	15.2. 'Mux Category' column for subregistries . . . . . . . . 72		15.2. 'Mux Category' column for subregistries . . . . . . . . 72
	15.2.1. Table: SDP bwtype . . . . . . . . . . . . . . . . . 72		15.2.1. Table: SDP bwtype . . . . . . . . . . . . . . . . . 72
	15.2.2. Table: att-field (session level) . . . . . . . . . . 73		15.2.2. Table: att-field (session level) . . . . . . . . . . 72
	15.2.3. Table: att-field (both session and media level) . . 73		15.2.3. Table: att-field (both session and media level) . . 73
	15.2.4. Table: att-field (media level only) . . . . . . . . 75		15.2.4. Table: att-field (media level only) . . . . . . . . 75
	15.2.5. Table: att-field (source level) . . . . . . . . . . 78		15.2.5. Table: att-field (source level) . . . . . . . . . . 78
	15.2.6. Table: content SDP Parameters . . . . . . . . . . . 79		15.2.6. Table: content SDP Parameters . . . . . . . . . . . 79
	15.2.7. Table: Semantics for the 'group' SDP Attribute . . . 79		15.2.7. Table: Semantics for the 'group' SDP Attribute . . . 79
	15.2.8. Table: 'rtcp-fb' Attribute Values . . . . . . . . . 80		15.2.8. Table: 'rtcp-fb' Attribute Values . . . . . . . . . 80
	15.2.9. Table: 'ack' and 'nack' Attribute Values . . . . . . 80		15.2.9. Table: 'ack' and 'nack' Attribute Values . . . . . . 80
	15.2.10. Table: 'depend' SDP Attribute Values . . . . . . . . 80		15.2.10. Table: 'depend' SDP Attribute Values . . . . . . . . 80
	15.2.11. Table: 'cs-correlation' Attribute Values . . . . . . 81		15.2.11. Table: 'cs-correlation' Attribute Values . . . . . . 81
	15.2.12. Table: Semantics for the 'ssrc-group' SDP Attribute 81		15.2.12. Table: Semantics for the 'ssrc-group' SDP Attribute 81
	15.2.13. Table: SDP/RTSP key management protocol identifiers 81		15.2.13. Table: SDP/RTSP key management protocol identifiers 81
	15.2.14. Table: Codec Control Messages . . . . . . . . . . . 82		15.2.14. Table: Codec Control Messages . . . . . . . . . . . 82
	15.2.15. Table: QoS Mechanism Tokens . . . . . . . . . . . . 82		15.2.15. Table: QoS Mechanism Tokens . . . . . . . . . . . . 82
	15.2.16. Table: SDP Capability Negotiation Option Tags . . . 82		15.2.16. Table: SDP Capability Negotiation Option Tags . . . 82
	15.2.17. Table: Timestamp Reference Clock Source Parameters . 83		15.2.17. Table: Timestamp Reference Clock Source Parameters . 83
	15.2.18. Table: Media Clock Source Parameters . . . . . . . . 83		15.2.18. Table: Media Clock Source Parameters . . . . . . . . 83
	16. Security Considerations . . . . . . . . . . . . . . . . . . . 84		16. Security Considerations . . . . . . . . . . . . . . . . . . . 84
	17. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 84		17. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 84
	18. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . 84		18. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . 84
	19. References . . . . . . . . . . . . . . . . . . . . . . . . . 87		19. References . . . . . . . . . . . . . . . . . . . . . . . . . 88
	19.1. Normative References . . . . . . . . . . . . . . . . . . 87		19.1. Normative References . . . . . . . . . . . . . . . . . . 88
	19.2. Informative References . . . . . . . . . . . . . . . . . 88		19.2. Informative References . . . . . . . . . . . . . . . . . 88
	Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 96		Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 96
	1. Introduction		1. Introduction
	SDP defines several attributes for capturing characteristics that		SDP defines several attributes for capturing characteristics that
	apply to the individual media descriptions (described by "m=" lines")		apply to the individual media descriptions (described by "m=" lines")
	and the overall multimedia session. Typically different media types		and the overall multimedia session. Typically different media types
	(audio, video, etc.) described using different media descriptions		(audio, video, etc.) described using different media descriptions
	represent separate RTP sessions that are carried over individual		represent separate RTP sessions that are carried over individual
	skipping to change at page 12, line 17 ¶		skipping to change at page 12, line 17 ¶
	This section analyzes attributes listed in [IANA], grouped under the		This section analyzes attributes listed in [IANA], grouped under the
	IETF document that defines them.		IETF document that defines them.
	The "Level" column indicates whether the attribute is currently		The "Level" column indicates whether the attribute is currently
	specified as:		specified as:
	o S -- Session level		o S -- Session level
	o M -- Media level		o M -- Media level
	o B -- Both		o B -- Both (Implies either a session level or a media level
			attribute)
	o SR -- Source-level (for a single SSRC) [RFC5576]		o SR -- Source-level (for a single SSRC) [RFC5576]
	The "Mux Category" column identifies multiplexing category assigned		The "Mux Category" column identifies multiplexing category assigned
	per attribute and the "Notes" column captures additional informative		per attribute and the "Notes" column captures additional informative
	details regarding the assigned category, wherever necessary.		details regarding the assigned category, wherever necessary.
	5.1. RFC4566: SDP		5.1. RFC4566: SDP
	[RFC4566] defines SDP that is intended for describing multimedia		[RFC4566] defines SDP that is intended for describing multimedia
	skipping to change at page 35, line 20 ¶		skipping to change at page 35, line 20 ¶
	also defines the syntax and semantics for an SDP 'fingerprint'		also defines the syntax and semantics for an SDP 'fingerprint'
	attribute that identifies the certificate that will be presented for		attribute that identifies the certificate that will be presented for
	the TLS session. This mechanism allows media transport over TLS		the TLS session. This mechanism allows media transport over TLS
	connections to be established securely, so long as the integrity of		connections to be established securely, so long as the integrity of
	session descriptions is assured.		session descriptions is assured.
	+--------------+-------------------------------+-------+------------+		+--------------+-------------------------------+-------+------------+
	| Name | Notes | Level | Mux |		| Name | Notes | Level | Mux |
	| | | | Category |		| | | | Category |
	+--------------+-------------------------------+-------+------------+		+--------------+-------------------------------+-------+------------+
	| fingerprint | fingerprint value from the | B | TRANSPORT |		| fingerprint | fingerprint value MUST be the | B | TRANSPORT |
	| | "m=" line defining the | | |		| | one that corresponds to the | | |
	| | underlying transport is | | |		| | "m=" line chosen for setting | | |
	| | chosen | | |		| | up the underlying transport | | |
			| | flow | | |
	| | | | |		| | | | |
	+--------------+-------------------------------+-------+------------+		+--------------+-------------------------------+-------+------------+
	5.36 RFC4572 Attribute Analysis		5.36 RFC4572 Attribute Analysis
	5.37. RFC4570: SDP Source Filters		5.37. RFC4570: SDP Source Filters
	[RFC4570] describes how to adapt SDP to express one or more source		[RFC4570] describes how to adapt SDP to express one or more source
	addresses as a source filter for one or more destination "connection"		addresses as a source filter for one or more destination "connection"
	addresses. It defines the syntax and semantics for an SDP "source-		addresses. It defines the syntax and semantics for an SDP "source-
	skipping to change at page 72, line 26 ¶		skipping to change at page 72, line 26 ¶
	Protocol (SDP) Parameters" registry. The tables list the column that		Protocol (SDP) Parameters" registry. The tables list the column that
	identifies the SDP attribute name/Token/Value from the corresponding		identifies the SDP attribute name/Token/Value from the corresponding
	subregistries and the values to be used for the new "Mux Category"		subregistries and the values to be used for the new "Mux Category"
	column to be added.		column to be added.
	For the entries in the existing subregistries, under the "Session		For the entries in the existing subregistries, under the "Session
	Description Protocol (SDP) Parameters" registry, that lack a value		Description Protocol (SDP) Parameters" registry, that lack a value
	for the "Mux Category" in this specification will get a value of		for the "Mux Category" in this specification will get a value of
	"TBD".		"TBD".
	Any future updates to the "Mux Category" column values needs to		The registration policy for updates to the 'Mux Category' column
	follow the existing registration policy of the affected table		values for existing parameters, or when registering new parameters,
	(Section 8.2.4.2 of [I-D.ietf-mmusic-rfc4566bis]).		are beyond the scope of this document. The registration policy for
			the affected table is defined in [I-D.ietf-mmusic-rfc4566bis].
	Also, the procedures from Section 8.2.4.1 of
	[I-D.ietf-mmusic-rfc4566bis] needs to be followed when assigning "Mux
	Category" value for the newly defined SDP attributes.
	15.2.1. Table: SDP bwtype		15.2.1. Table: SDP bwtype
	The following values are to be added to the 'SDP bwtype' subregistry		The following values are to be added to the 'SDP bwtype' subregistry
	in the "Session Description Protocol (SDP) Parameters" registry. The		in the "Session Description Protocol (SDP) Parameters" registry. The
	references should be updated to point at this RFC as well as the		references should be updated to point at this RFC as well as the
	previous references.		previous references.
	+----------+--------------+		+----------+--------------+
	| SDP Name | Mux Category |		| SDP Name | Mux Category |
	skipping to change at page 84, line 7 ¶		skipping to change at page 84, line 7 ¶
	+-----------+--------------+		+-----------+--------------+
	| Name | Mux Category |		| Name | Mux Category |
	+-----------+--------------+		+-----------+--------------+
	| sender | NORMAL |		| sender | NORMAL |
	| direct | NORMAL |		| direct | NORMAL |
	| IEEE1722 | NORMAL |		| IEEE1722 | NORMAL |
	+-----------+--------------+		+-----------+--------------+
	16. Security Considerations		16. Security Considerations
	This document does not add any new security considerations beyond the
	existing considerations in the RTP RFCs ([RFC3550] and [RFC3711])
	that are referenced by this specification.
	The primary security for RTP including the way it is used here is		The primary security for RTP including the way it is used here is
	described in [RFC3550] and [RFC3711].		described in [RFC3550] and [RFC3711].
	When multiplexing SDP attributes with the category "CAUTION", the		When multiplexing SDP attributes with the category "CAUTION", the
	implementations should be aware of possible issues as described in		implementations should be aware of possible issues as described in
	this specification.		this specification.
	17. Acknowledgments		17. Acknowledgments
	I would like to thank Cullen Jennings, Flemming Andreasen for		I would like to thank Cullen Jennings, Flemming Andreasen for
	skipping to change at page 84, line 46 ¶		skipping to change at page 84, line 42 ¶
	Ian Johansson(5.15), Saravanan Shanmugham(5.11), Paul E Jones(5.30),		Ian Johansson(5.15), Saravanan Shanmugham(5.11), Paul E Jones(5.30),
	Rajesh Kumar(5.48), Jonathan Lennox(5.36,5,15,9.1,11.1), Mo		Rajesh Kumar(5.48), Jonathan Lennox(5.36,5,15,9.1,11.1), Mo
	Zanaty(5.4,5.5,5.23,8.1,8.3,8.5,12.1), Christian Huitema (5.14), Qin		Zanaty(5.4,5.5,5.23,8.1,8.3,8.5,12.1), Christian Huitema (5.14), Qin
	Wu (5.47 PM-Dir review), Hans Stokking(5.43,5.16), Christian Groves		Wu (5.47 PM-Dir review), Hans Stokking(5.43,5.16), Christian Groves
	(5.48,5.55), Thomas Stach.		(5.48,5.55), Thomas Stach.
	I would like to thank Chris Lonvick for the SECDIR review, Dan		I would like to thank Chris Lonvick for the SECDIR review, Dan
	Romascanu for th Gen-ART review and Sabrina Tanamal for the IANA		Romascanu for th Gen-ART review and Sabrina Tanamal for the IANA
	review.		review.
	Thanks to Ben Campbell for AD review suggestions.		Thanks to Ben Campbell for AD review suggestions. Thanks to Spencer
			Dawkins, Stephen Farrel, Alissa Cooper, Mirja Kuehlewind and the
			entire IESG experts for their reviews.
	18. Change Log		18. Change Log
	[RFC EDITOR NOTE: Please remove this section when publishing]		[RFC EDITOR NOTE: Please remove this section when publishing]
			Changes draft-ietf-mmusic-sdp-mux-attributes-14
			o Incorporated Comments from IESG review :
			* Updated security considerations section to fix the
			incositencies (Spencer's review)
			* Updated section 5.36 to align the text with 5.39 (Stephen's
			review)
			* Updated IANA registration section to make RFC4566bis a
			informative dependency (IETF 98 followup)
			* Updated Section 5 to expand 'B' level SDP attributes (Dan's
			review)
	Changes from draft-ietf-mmusic-sdp-mux-attributes-10 - draft-ietf-		Changes from draft-ietf-mmusic-sdp-mux-attributes-10 - draft-ietf-
	mmusic-sdp-mux-attributes-13		mmusic-sdp-mux-attributes-13
	o Incorporated Comments from WGLC review and AD Evaluation		o Incorporated Comments from WGLC review and AD Evaluation
	Changes from draft-ietf-mmusic-sdp-mux-attributes-10		Changes from draft-ietf-mmusic-sdp-mux-attributes-10
	o Incorporated Comments from Bo Burman for publication request		o Incorporated Comments from Bo Burman for publication request
	Changes from draft-ietf-mmusic-sdp-mux-attributes-08 to draft-ietf-		Changes from draft-ietf-mmusic-sdp-mux-attributes-08 to draft-ietf-
	skipping to change at page 88, line 5 ¶		skipping to change at page 88, line 13 ¶
	o Updated IANA Consideration Section.		o Updated IANA Consideration Section.
	Changes from draft-nandakumar-mmusic-mux-attributes-00		Changes from draft-nandakumar-mmusic-mux-attributes-00
	o Added new section for dealing with FEC payload types.		o Added new section for dealing with FEC payload types.
	19. References		19. References
	19.1. Normative References		19.1. Normative References
	[I-D.ietf-mmusic-rfc4566bis]
	Handley, M., Jacobson, V., Perkins, C., and A. Begen,
	"SDP: Session Description Protocol", draft-ietf-mmusic-
	rfc4566bis-17 (work in progress), June 2016.
	[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-24 (work in progress), January 2016.		negotiation-24 (work in progress), January 2016.
	[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate		[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
	Requirement Levels", BCP 14, RFC 2119, March 1997.		Requirement Levels", BCP 14, RFC 2119, March 1997.
	[RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session		[RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session
	skipping to change at page 88, line 34 ¶		skipping to change at page 88, line 37 ¶
	IANA Considerations Section in RFCs", BCP 26, RFC 5226,		IANA Considerations Section in RFCs", BCP 26, RFC 5226,
	DOI 10.17487/RFC5226, May 2008,		DOI 10.17487/RFC5226, May 2008,
	<http://www.rfc-editor.org/info/rfc5226>.		<http://www.rfc-editor.org/info/rfc5226>.
	19.2. Informative References		19.2. Informative References
	[H.248.15]		[H.248.15]
	"Gateway control protocol: SDP H.248 package attribute",		"Gateway control protocol: SDP H.248 package attribute",
	<http://www.itu.int/rec/T-REC-H.248.15>.		<http://www.itu.int/rec/T-REC-H.248.15>.
			[I-D.ietf-mmusic-rfc4566bis]
			Handley, M., Jacobson, V., Perkins, C., and A. Begen,
			"SDP: Session Description Protocol", draft-ietf-mmusic-
			rfc4566bis-17 (work in progress), June 2016.
	[IANA] "Session Description Protocol (SDP) Parameters",		[IANA] "Session Description Protocol (SDP) Parameters",
	<http://www.iana.org/assignments/sdp-parameters/		<http://www.iana.org/assignments/sdp-parameters/
	sdp-parameters.xml>.		sdp-parameters.xml>.
	[Q.1970] "Q.1970 : BICC IP bearer control protocol",		[Q.1970] "Q.1970 : BICC IP bearer control protocol",
	<https://www.itu.int/rec/T-REC-Q.1970-200609-I/en>.		<https://www.itu.int/rec/T-REC-Q.1970-200609-I/en>.
	[R3GPPTS183.063]		[R3GPPTS183.063]
	"TISPAN - IMS based ITPV Stage 3 specification.",		"TISPAN - IMS based ITPV Stage 3 specification.",
	<http://www.etsi.org/deliver/		<http://www.etsi.org/deliver/
End of changes. 13 change blocks.
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