ISO/IEC JTC 1 Special Working Group on Accessibility (SWG-A)

JTC 1 SWG-A N 108

2005-11-29

Document Type:	Contribution
Title:	Updated Standards Overview for Accessible Real Time Conversation
Source:	Gunnar Hellström, Omnitor
Action ID:
Requested Action:	For consideration by the JTC 1 SWG on Accessibility.

JTC 1 SWG on Accessibility Secretariat
ITI/INCITS
1250 Eye Street NW, Suite 200, Washington, DC 20005
jgarner@itic.org

Attached you can find an updated version of the overview over standards related to accessible conversational services.

The main new thing is the approval of the ETSI EG 202 320 DUST Guide.

I think this list can be useful as a reference collection.

Regards

Gunnar

-----------------------------------------------------------------------------

Gunnar Hellström, Omnitor

gunnar.hellstrom@omnitor.se

Mob: +46 708 204 288

Phone: +46 8 556 002 03

www.omnitor.se

11 November, 2005/ Gunnar Hellström, Omnitor

Accessible real time conversational services.
Summary of overviews, specifications and standards

This is an overview of specifications related to accessible real time conversation, including Total Conversation and Text Telephony. The reader must be aware of that the work in the standards groups move on, and new versions of the referenced specifications may take effect. For implementation, only the versions retrieved directly from the standard bodies shall be used and verifying that the version is valid.

For 3GPP, the specifications can be found in the "Document area" under www.3gpp.org

For ITU-T, the recommendations can be found under http://www.itu.int/ITU-T/publications/recs.html .

For IETF, the specifications can be found under www.ietf.org .

For ETSI, the specifications can be found under www.etsi.org .

All 3GPP specifications related to text telephony and total conversation are accepted as ETSI technical specifications and are listed under ETSI below.

Overviews, articles, regulations, policy statements

*Document*	*Full name*	*Explanation*	Type
COCOM 04-08	INCOM Report	Report on eAccessibility to EU regulatory group COCOM	Priority action requirements
TCAM 17(64)	TCAM eAccessibility	Request to TCAM for terminal related action for accessibility	action request from EC
TCAM 17(64) presentation	TCAM eAccessibility	Presentation to TCAM 17 on real time conversation needs	Powerpoint presentation

Standards and specifications

IETF accessibility specific documents

*Standard*	*Full Name of Standard*	*Explanation*	Type	Status
IETF RFC 4102	Registration of text/red	MIME registration of text with redundancy	MIME reg	Approved
IETF RFC 4103	RTP Payload for Text Conversation.	RTP Payload for T.140 text conversation. MIME Registered as "text/t140", used in H.323 and SIP	Transport	Approved replaces RFC 2793
draft-ietf-sipping-toip-03	Framework of requirements for real-time text conversation using SIP		Requirements	Draft
IETF RFC 3351	User Requirements for the Session Initiation Protocol (SIP) in Support of Deaf, Hard of Hearing and Speech-impaired Individuals	Handles transcoding and other value added services invoked through SIP.	Requirements	Approved
draft-ietf-sipping-transc-conf-00	The session Initiation Protocol Conference bridge transcoding model	Mentioned that it can be used for invocation of relay services	Procedure specification	Draft
draft-ietf-avt-audio-t140c-00	RTP Payload for Text Conversation interleaved in an audio stream	RTP Payload for text, intended for transit gateways where number of ports may be an issue.	Transport	Approved, awating RFC publication as historic

IETF General documents of specific interest for accessibility

*Specification*	*Title*	*Explanation*	*Type*	*Status*
IETF RFC 2327	SDP; Session Description Protocol	Parameters and formats for call setup in SIP	Call control	Approved
IETF RFC 3261	SIP; Session Initiation Protocol	Session initiation Protocol – used to connect Voice over IP (Internet Protocol) phone calls.	Call control	Approved
IETF RFC 2833	RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals	Encoding and transport of tones over IP	Transport	Approved
draft-ietf-mmusic-sdp-new-25	Session Description Protocol	Contains "text" as an allowable media type. Intended to replace RFC3261	Call control	Draft, for approval
IETF RFC 2198	Redundancy for RTP payloads	Used in RFC4103 for reliability of text traffic	Transport	Approved
IETF RFC 3840	Indicating User Agent Capabilities in the Session Initiation Protocol (SIP)	Can be useful for preference and capability indication for service invocation	Call control	Approved
IETF RFC 3841	Caller Preferences for the Session Initiation Protocol	Can be useful for preference and capability indication for service invocation	Call control	Approved
draft-ietf-avt-rfc2833bisdata	Definition of Events For Modem, FAX, and Text Telephony Signals	Text telephone signals expanded, will replace RFC2833	Transport	Draft
draft-sinnreich-sipdev-req	SIP Telephony Device Requirements, Configuration and Data	text requirements included	Device requirements	Draft
IETF RFC 3550	RTP; Real Time Protocol	Media protocol in SIP and others	Transport	Approved
IETF RFC 3711	SRTP; Secure Real Time Protocol	Encryption etc on RTP	Transport	Approved
draft-ietf-ecrit-requirements-01.txt	Requirements for Emergency Context Resolution with Internet Technologies	Requirements for emergency services in IP	Service requirements	Draft

ITU Accessibility specific documents

Document	Title	Explanation	Type	Status
ITU-T Rec. V.18	Operational and Interworking Requirements for DCE:s Operating in the Text Telephone Mode	Includes automatic interworking with most legacy text telephones.	Modem transport	Approved
ITU-T Study Group 16 V.151 (in process)	Text Telephony over IP	Text Telephony transit through IP.	Gateway	Draft
ITU-T Rec. F.703	Multimedia conversational services	Defines Text Telephony and Total Conversation services	Service description	Approved
ITU-T Rec. H.224	A real time control protocol for simplex applications using the H.221 LSD/HSD/HLP channel.	Addition of client id=2 for T.140 text transport	Transport	Approved
ITU-T Rec. H.323 Annex G	Text Conversation and Text SET.	Defines T.140 text inclusion in H.323 IP Multimedia	Call control	Approved
ITU-T Rec H.323 Annex G v2	Text Conversation and Text SET.	Defines T.140 text inclusion in H.323 IP Multimedia	Call control	Approved
ITU-T Rec.T.134	Text Chat Application Entity	Application for text conversation in the T.120 data conferencing concept.	Transport	Approved
ITU-T Rec. T.140	Protocol for multimedia application text conversation.	Text conversation protocol for multimedia application. With amendment 1 (2000).	Presentation level	Approved
ITU-T Rec.T.140 - Addendum	Marking of missing characters	Replacement for characters missing after transmission	Presentation	Approved
H Series Supplement 1	Video Quality for sign language and lip reading	Quality characteristics of video transmission of importance for sign language and lip-reading use.	Requrement	Approved
ITU-T Rec. H.248.2v2	Packages for fax, text and call discrimination	Text telephony to text over IP gateway. Approved revision.	Gateway	Approved

ITU general documents of accessibility interest

*Standard*	*Full Name of Standard*	*Explanation*	*Type*	*Status*
ITU-T Recommendation H.248	Gateway control protocol	Control of gateways.	Gateway	Approved
ITU-T Recommendation H.248.21	Controlled multimedia conferences	Includes text	Conference control protocol	Approved
ITU-T Rec. F.700	Famework Recommendation for multimedia services, Annex A.3.	Multimedia Framework, including real time text	Service description	Approved
ITU-T Rec.V.250	Serial asynchronous automatic dialling and control	Contains modem control for V.18	Call control	Approved
ITU-T Recommendation V.8	Procedures for starting sessions of data transmission over the public switched telephone network	Contains call function = text telephony	Call control	Approved
ITU-T Recommendation V.8 bis	Procedures for the identification and selection of common modes of operation between Data Circuit-terminating Equipments (DCEs) and between Data Terminal Equipments (DTEs) over the public switched telephone network	Contains procedures for starting simultaneous voice and text in V.18.	Call control	Approved
ITU-T V.150.1	Modem transit over IP	International Recommendation for transport of Modem over IP	Gateway	Approved
ITU-T Rec.V.152	Procedures for supporting Voice Band Data over IP networks	Usable for text telephony transit through IP networks	Gateway	Approved
ITU-T Rec.H.324	Terminal for low bit-rate multimedia communication	Addition of data channel for T.140 text	Multimedia system	Approved
ITU-T Rec. V.61	Analog simultaneous voice and data (permits Voice carry over with ASCII modems	Possible to use under V.18	Modem transport	Approved
ITU-T Rec.H.320	ISDN visual telephone systems and terminal equipment.	Text conversation added	Multimedia system	Approved
ITU-T Rec. H.245	Control Protocol for Multimedia Communication	Multimedia Control protocol, includes setup of text channels	Call control	Approved
ITU Y.1541	Network performance objectives for IP-based services		Requirement	Approved
NGN Release 1 Scope	Scope for next generation network	Real time text included	Requirements	Draft
NGN Release 1 Requirements	Requirements for next generation networks	Accessibility additions propoed	Requirements	Draft
F.724	IP Videophone service description	Real time text included	Service description	Approved
F.733