1、 ETSI EG 202 320 V1.2.1 (2005-10)ETSI Guide Human Factors (HF);Duplex Universal Speech and Text (DUST)communicationsETSI ETSI EG 202 320 V1.2.1 (2005-10) 2 Reference DEG/HF-00057 Keywords digital, disability, speech, text, video ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel
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5、nd errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproductio
6、n in all media. European Telecommunications Standards Institute 2005. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTMand the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members.
7、3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI EG 202 320 V1.2.1 (2005-10) 3 Contents Intellectual Property Rights8 Foreword.8 Executive summary 8 1 Scope 9 2 References 9 3 Definitions and abbreviations.12 3.1 Definitions1
8、2 3.2 Abbreviations .14 4 General .15 4.1 Basic considerations .15 4.2 Additional facilities 15 4.3 Special provisions.16 4.4 Current situation.16 5 The DUST concept.16 6 User requirements 17 6.1 General considerations .17 6.1.1 Universality.17 6.1.2 Call setup 18 6.1.3 Conversational text .18 6.1.4
9、 Conversational quality 18 6.1.5 Speech communication.18 6.1.6 Display19 6.1.7 Loss in transmission19 6.1.8 Editing 19 6.1.9 Service accessibility19 6.1.10 Call progress information .19 6.1.11 Conferencing.20 6.1.12 Multimedia telephony.20 6.1.13 Terminal configurability.20 6.1.14 Signing and liprea
10、ding20 6.1.15 Service configurability20 6.1.16 Call configurability.21 6.1.17 Relay services .21 6.1.18 Masquerade.21 6.1.19 Integrity 21 6.1.20 Confidentiality 21 6.2 Technical considerations 21 6.2.1 Universality.21 6.2.2 Call setup 22 6.2.3 Conversational text .22 6.2.4 Conversational quality 22
11、6.2.5 Speech communication.23 6.2.6 Display23 6.2.7 Loss in transmission23 6.2.8 Editing 23 6.2.9 Service accessibility23 6.2.10 Call progress information .24 6.2.11 Conferencing.24 6.2.12 Multimedia telephony.24 6.2.13 Terminal configurability.24 6.2.14 Signing and lipreading24 6.2.15 Service confi
12、gurability25 ETSI ETSI EG 202 320 V1.2.1 (2005-10) 4 6.2.16 Call configurability.25 6.2.17 Relay services .25 6.2.18 Masquerade.25 6.2.19 Integrity 25 6.2.20 Confidentiality 25 6.3 User requirements from Legislation.26 6.3.1 Directive 2000/78/EC .26 6.3.2 Directive 2002/21/EC .26 6.3.3 Directive 200
13、2/22/EC .26 6.3.4 Directive 2004/18/EC .26 7 Stage 1 outline27 7.1 Introduction 27 7.2 Definition .27 7.3 Description .28 7.3.1 General description.28 7.3.2 Procedures.29 7.3.2.1 Provision/withdrawal 29 7.3.2.2 Normal procedures29 7.3.2.2.1 Activation/deactivation29 7.3.2.2.2 Invocation and operatio
14、n .29 7.3.2.3 Exceptional procedures .29 7.4 Overall behaviour.30 8 Stage 2 outline30 9 Host environments30 9.1 Introduction 30 9.2 Requirements on host environments.31 9.3 Regulated environments .32 9.3.1 CLIP/CLIR .32 9.3.2 MCID32 9.3.3 Lawful Interception.32 9.4 Target implementation .32 9.5 Term
15、inals supporting DUST 32 9.6 DUST interoperability targets 33 9.7 Generic Firewall and NAT traversal 33 9.7.1 Introduction.33 9.7.2 Firewalls .34 9.7.3 NAT traversal .34 9.7.4 NAT traversal solutions 34 10 Numbering, naming and addressing.35 10.1 ENUM 35 10.1.1 E.164 to URI DDDS Application (ENUM) 3
16、5 10.1.2 Enumservice Registration for Presence Services35 10.2 Distributed Universal Numbering Discovery (DUNDi).36 10.3 Universal Communications Identifier (UCI)36 11 Presentation characteristics 37 12 Service capability requirements .38 12.1 Emergency services for DUST users38 12.1.1 PSTN based Em
17、ergency service centre 38 12.1.2 IP based emergency service centre .38 12.2 Relay services.39 12.2.1 Types and purposes of relay services39 12.2.2 Invocation of relay services 39 13 DUST and legacy systems40 13.1 Alternative approaches .40 13.2 DUST/legacy interoperability 40 13.2.1 Gateway support
18、between legacy and DUST users 40 13.2.2 Procedures for text aware gateways42 ETSI ETSI EG 202 320 V1.2.1 (2005-10) 5 13.2.2.1 Scenario 1: Carrier based PSTN Text Telephone42 13.2.2.2 Scenario 2: Carrier-less PSTN Text Telephone 43 13.2.2.3 Scenario 3: IP end-point originating call to PSTN44 13.2.3 P
19、rocedures for text specific gateways.45 13.2.4 Common procedures for conveying text in calls through a gateway. .45 13.2.5 Alternating text and voice through a gateway.46 13.2.6 Simultaneous text and voice through the gateway46 13.2.7 Gateway invocation 46 13.2.8 Invoking gateways to support DUST ca
20、lls .47 13.3 Transmission problems for legacy text telephony in new environments48 14 Requirements for DUST verified against technical facilities.49 15 Outstanding issues53 16 Summary and recommendations 53 Annex A (informative): Text conversation - The existing situation.54 A.1 Text telephony54 A.2
21、 Current PSTN textphone systems.54 A.2.1 Overview 54 A.2.2 DTMF.54 A.2.3 EDT54 A.2.4 V.2154 A.2.5 Minitel 55 A.2.6 EIA-825 (“Baudot“) .55 A.2.7 Bell 103 (“ASCII“).55 A.2.8 V.1855 A.2.9 Other PSTN text telephone systems .55 A.2.10 Summary of existing PSTN textphone systems56 A.3 Establishing a call.5
22、7 A.3.1 Terminal to terminal over a PSTN connection.57 A.3.2 Terminal to terminal over an ISDN connection .59 A.3.3 Terminal to terminal over a GSM connection 61 A.3.4 Terminal to terminal over packet networks61 A.3.4.1 General packet network 61 A.3.4.2 IP Network61 A.3.4.3 Managed IP Network62 A.3.
23、5 Indirect access 62 A.4 System problems 63 A.5 Mobile systems for interactive text conversation.63 A.5.1 Global Text Telephony in the GSM and 3GPP network 63 A.5.2 Text telephony in the GSM data channel .64 A.5.3 Text telephony using the GPRS IP access channel 64 A.5.4 Global Text Telephony in 3G I
24、P multimedia services .64 A.6 IP based text .64 A.6.1 Chat systems.64 A.6.1.1 IRC - Internet Relay Chat, WebChat 64 A.6.1.2 Instant Messaging .65 A.6.2 SIP standard based text conversation .66 A.6.3 H.323 standard based text conversation .66 A.6.4 Proprietary text conversation66 A.7 Speech and text.
25、67 A.8 Total Conversation .67 A.9 Special services 67 A.9.1 Emergency services67 A.9.2 Relay services.68 ETSI ETSI EG 202 320 V1.2.1 (2005-10) 6 Annex B (informative): Stage 2 description of DUST (simplified).69 B.1 Introduction 69 B.2 Functional entity model and information flows .70 B.2.1 Function
26、al entity model70 B.2.1.1 Description of model 70 B.2.1.2 Description of functional entities72 B.2.1.2.1 Calling User 72 B.2.1.2.2 Calling Users service agent, FE1OTC72 B.2.1.2.3 The policy control function associated with the calling users service provider, FE2PE72 B.2.1.2.4 Originating network cal
27、l coordination function, FE3ONC.72 B.2.1.2.5 Originating network routing function, FE4OR.72 B.2.1.2.6 Originating network media coordination function, FE5ONM72 B.2.1.2.7 Intervening network call coordination function, FE6INC.72 B.2.1.2.8 Intervening network routing function, FE7IR.72 B.2.1.2.9 Inter
28、vening network media coordination function, FE8INM72 B.2.1.2.10 Destination network call coordination function, FE9TNC73 B.2.1.2.11 Destination network media coordination function, FE10TNM.73 B.2.1.2.12 Called users service agent, FE11TTC73 B.2.1.2.13 Called User73 B.2.2 Information flows.73 B.2.2.1
29、 Definition of information flows73 B.2.2.1.1 Relationship ra 73 B.2.2.1.1.1 CC_OrigCallSetup.73 B.2.2.1.1.2 TCC_CallRelease 75 B.2.2.1.1.3 TCC_CallAlerting .75 B.2.2.1.2 Relationship rb 75 B.2.2.1.2.1 CallAuthorization 75 B.2.2.1.3 Relationship rc 75 B.2.2.1.3.1 CallSetup .75 B.2.2.1.3.2 CallRelease
30、76 B.2.2.1.3.3 CallAlerting.76 B.2.2.1.4 Relationship rd, rg.76 B.2.2.1.4.1 CallRoute.76 B.2.2.1.5 Relationship re, rh, rj.77 B.2.2.1.5.1 MediaReservation77 B.2.2.1.5.2 MediaEstablishment 77 B.2.2.1.5.3 MediaRelease 77 B.2.2.1.6 Relationship rf, ri 77 B.2.2.1.6.1 NwCallSetup .77 B.2.2.1.6.2 NwCallRe
31、lease 78 B.2.2.1.6.3 NwCallAlerting .78 B.2.2.1.7 Relationship rk 78 B.2.2.1.7.1 DestCallSetup78 B.2.2.1.7.2 CallRelease78 B.2.2.1.8 Relationship rl.79 B.2.2.1.8.1 TCC_DestCallSetup 79 B.2.2.1.8.2 TCC_CallRelease 79 B.2.2.2 Timers.79 Annex C (informative): Stage 3 requirements - Session Initiation P
32、rotocol (SIP) .80 C.1 DUST Characteristics in SIP environment.80 C.2 Signalling characteristics80 C.3 Transmission characteristics.80 C.3.1 Control of transmission characteristics.80 C.3.1.1 Transport mechanism81 C.3.1.1.1 Packetizing81 ETSI ETSI EG 202 320 V1.2.1 (2005-10) 7 C.3.1.1.2 Text transmis
33、sion with RTP81 C.3.1.1.3 Reliability81 C.3.1.1.4 Error recovery .81 C.3.1.1.5 Security .81 C.4 Support of supplementary services.82 Annex D (informative): Stage 3 requirements - ITU-T Recommendation H.323.83 D.1 H.32383 Annex E (informative): Stage 3 requirements - ISDN 84 E.1 H.32084 E.2 ITU-T Rec
34、ommendation H.324 and H.22584 Annex F (informative): Stage 3 requirements - 3GPP85 F.1 3GPP IP Multimedia Subsystem 85 F.2 3GPP Circuit-Switched CS MM 85 Annex G (informative): Stage 3 Requirements - Data conferencing86 G.1 T.120 86 Annex H (informative): Reference software.87 H.1 Reference software
35、 information .87 H.2 Executable IP text telephone SIPcon187 H.3 Source code for T.140 text presentation protocol 87 H.4 Source code for IP transport of text88 Annex I (informative): Bibliography.89 History 91 ETSI ETSI EG 202 320 V1.2.1 (2005-10) 8 Intellectual Property Rights IPRs essential or pote
36、ntially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential
37、, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No g
38、uarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This ETSI Guide (EG) has been produced by ETSI Technical Committee Human Factors (HF). Ex
39、ecutive summary Text communication services such as chat, instant messaging, SMS and e-mail are now mainstream digital services, but have the disadvantage that they do not provide a fluent conversation. Real time conversational text provides a fluency of conversation, which avoids the disjointed eff
40、ects of speaking out of turn that often occurs in messaging systems. Real time conversational text has up till now been largely restricted to expensive specialized terminals used mainly by the deaf community. The present document describes a design for all solution providing real time conversational
41、 services that support text, speech and optionally video on current and future networks. The present document identifies user requirements for a conversational text service in clause 6.1, describes the requirements for the solution in clause 6.2, and clauses 7 to 12 give details of how existing text
42、phone systems can migrate to the new service in clause 13. Annex A reports the study of the many different textphone systems currently in use. Proposals for further work to deal with currently unsolved problems are contained in clauses 15 and 16. ETSI ETSI EG 202 320 V1.2.1 (2005-10) 9 1 Scope The p
43、resent document sets out detailed and practical requirements for Duplex Universal Speech and Text (DUST) protocols and services that provide enhanced real time text and speech conversation for all users. The present document identifies existing textphones, chat systems and protocols, identifies user
44、 requirements for effective text and telephone conversation, and gives methods of fulfilling these requirements. The present document identifies necessary extensions to signalling protocols and transport facilities of current multimedia systems to achieve the DUST requirements. In addition, the pres
45、ent document sets out a migration process from existing national textphone systems. The present document points out where further standardization work is required to resolve any remaining problems. The present document contains information applicable to network operators, service providers, terminal
46、 and network manufacturers. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a
47、specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. 1 BT SIN 359: “BT TextDirect Service Descript
48、ion“. 2 CEPT T/CS 34-15: “Aspects techniques du terminal audiographique (Text telephone)“. 3 ETSI EG 202 116: “Human Factors (HF); Guidelines for ICT products and services; “Design for All“. 4 ETSI EG 203 072: “Universal Communications Identifier (UCI); Results of a detailed study into the technical
49、 areas for identification harmonization; Recommendations on the UCI for NGN“. 5 ETSI ETR 250: “Transmission and Multiplexing (TM); Speech communication quality from mouth to ear for 3,1 kHz handset telephony across networks“. 6 ETSI ETR 297: “Human Factors (HF); Human factors in videotelephony“. 7 ETSI ETR 333: “Human Factors (HF); Text telephony; Basic user requirements and recommendations“. 8 ETSI SR 002 180: “Requirements for communication of citizens with authorities/organizations in case of distress (emergency call handling)“. 9 ETSI SR 002 299
