1、 ETSI TR 102 575 V1.2.1 (2016-03) Human Factors (HF); An IP-based text telephony solution known as “Reliable RTT“ TECHNICAL REPORT ETSI ETSI TR 102 575 V1.2.1 (2016-03) 2 Reference RTR/HF-00161 Keywords HF, IP, mobile, telephony, terminal, text ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Ce
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7、nd to reproduction in all media. European Telecommunications Standards Institute 2016. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members
8、 and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TR 102 575 V1.2.1 (2016-03) 3 Contents Intellectual Property Rights 4g3Foreword . 4g3Modal verbs terminology 4g3Introduction 4g31 Scope 5g32 References 5g32.1 Normati
9、ve references . 5g32.2 Informative references 5g33 Definitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 7g34 Evolving enabler technologies and user requirements . 7g34.1 From local availability to mainstream integration 7g34.2 Generic, context-specific user requirements. 8g35 Te
10、chnical details . 9g3History 10g3ETSI ETSI TR 102 575 V1.2.1 (2016-03) 4 Intellectual Property Rights IPRs essential or potentially 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
11、 non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, 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 (https:/ipr.etsi.org/).
12、 Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee 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 presen
13、t document. Foreword This Technical Report (TR) has been produced by ETSI Technical Committee Human Factors (HF). Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described
14、 in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. Introduction ICT-mature and experienced end users often wish to extend the reach of their text communication serv
15、ices beyond the limited range of traditional, desk-based text telephones i.13, in many cases being the only option on offer. Furthermore, users prefer inter-connectivity with other text telephony services (e.g. between v.21-based fixed network text telephone services, voice and sign relay services s
16、upporting a multitude of devices, and emergency services). Some well-established legacy solutions and other, currently deployed and emerging standardized technologies provide a solid, basic, framework for the provision of text communication services perceived as real-time by the user. Users prefer a
17、nd require reliable text communication services supporting main-stream, off-the-shelf and out-of-the-box mobile devices, Internet applications, Web clients and v.21 text telephones i.1 and i.12. In the era of continuous IMS-based service availability, the technology described in the present document
18、 will become historical. However, it may take time to embrace the most recent generation of mobile, IP-based technologies on a large scale and reach nation-wide coverage with the real-time text option implemented, supported and used - a reason why other solutions, based on plain Internet access may
19、be considered alternatives for the provision of RTT. The method described in the present document, “Reliable RTT“, is reliable for end users, with a low risk for loss of characters. Furthermore, although not part of the specification, the connection of the communication session can be made such that
20、 the device identity of the counterpart is assured. ETSI ETSI TR 102 575 V1.2.1 (2016-03) 5 1 Scope The present document provides a description of user, functional and some technical aspects of an IP-based text telephony solution known and deployed as “Reliable RTT“, supporting the use of fixed and
21、mobile mainstream devices. The present document provides a pointer to the source where the full details of the implementation, including a private Session Initiation Protocol header and some SIP examples, are made openly and freely available to any developer, service provider or other stakeholder in
22、terested in the solution. The present document carries no operational, interoperability or other requirements on terminal manufacturers, software developers or fixed or mobile network operators or service providers or their regulators, who are not involved in the provision of the solution described.
23、 2 References 2.1 Normative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (incl
24、uding any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term
25、validity. The following referenced documents are necessary for the application of the present document. Not applicable. 2.2 Informative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only
26、 the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyp
27、erlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 Swedish Post a
28、nd Telecom Authority: “Real-time text (RTT) using SIP Message IETF RFC 3428: Technical specification: Reliable RTT (real-time text)“. NOTE: Available at http:/www.pts.se/reliableRTT. i.2 ETSI ES 202 975: “Human Factors (HF); Requirements for relay services“. i.3 ETSI TR 102 548: “Human Factors (HF);
29、 User Experience; 3G and Mobile Broadband Interoperability Plugtest: Approach, scenarios and test specification; Outcomes, conclusions and recommendations“. i.4 ETSI/CEN/CENELEC EN 301 549: “Human Factors; Accessibility requirements suitable for public procurement of ICT products and services in Eur
30、ope“. i.5 ETSI EG 202 416: “Human Factors (HF); User Interfaces; Setup procedure design guidelines for mobile terminals and services“. ETSI ETSI TR 102 575 V1.2.1 (2016-03) 6 i.6 ETSI EG 202 417: “Human Factors (HF); User education guidelines for mobile terminals and services“. i.7 ETSI EG 202 423:
31、“Human Factors (HF); Guidelines for the design and deployment of ICT products and services used by children“. i.8 ETSI TS 126 114: “Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS); Multimedia telephony; Media handling and interaction (3GPP TS 26.114)“. i.9 ETSI
32、EG 202 320: “Human Factors (HF); Duplex Universal Speech and Text (DUST) communications“. i.10 ISO 26800: (2011): “Ergonomics - General approach, principles and concepts“. i.11 IETF RFC 4103 (June 2005): “RTP Payload for Text Conversation“. i.12 IETF RFC 3428: “Session Initiation Protocol (SIP) Exte
33、nsion for Instant Messaging“. i.13 Swedish Post and Telecom Authority: “rebro Lns Landsting - Psykiatri och Habilitering: “Frsksprojekt FLEXITEXT - Flexibel texttelefoni“ (in Swedish; in translation: “rebro County Council: The FLEXITEXT trial project - Flexible text telephony“). NOTE: Available at h
34、ttp:/www.pts.se/upload/Rapporter/Funktionshinder/2011/Flexitext-slutrapport-110630.pdf. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: accessibility: extent to which products, systems, services, environments and fa
35、cilities can be used by people from a population with the widest range of characteristics and capabilities, to achieve a specified goal in a specified context of use NOTE 1: Context of use includes direct use or use supported by assistive technologies. NOTE 2: The context in which the ICT is used ma
36、y affect its overall accessibility. This context could include other products and services with which the ICT may interact. NOTE 3: See definition in ISO 26800 i.10. real-time text: form of text conversation in point to point situations or in multipoint conferencing where the text being entered is d
37、isplayed in such a way that the communication is perceived by the user as being continuous relay service: telecommunications service that enables users of different modes of communication to interact by providing conversion between the modes of communication sign (or video) relay service: service th
38、at enables sign language users and other users to interact by providing conversion between the two modes of communication in substantially real-time, typically provided by a human operator terminal: combination of hardware and/or software with which the end user directly interacts and that provides
39、the user interface NOTE 1: The hardware may consist of more than one device working together e.g. a mobile device and a computer. NOTE 2: For some systems, the software that provides the user interface may reside on more than one device such as a telephone and a server. text relay service: telecommu
40、nications service that enables text telephone users and voice telephone users to interact by providing conversion between the two modes of communication in substantially real-time, typically provided by a human operator text telephone: device offering text telephony functions, either as a stand-alon
41、e unit or as an addition to a voice telephone or as an application in a multi-function computer based terminal or device ETSI ETSI TR 102 575 V1.2.1 (2016-03) 7 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: ICT Information and Communication Technologi
42、es IETF Internet Engineering Task Force IM Instant Messaging IMS IP Multimedia Subsystem IP Internet Protocol PSTN Public Switched Telephone Network RTT Real-Time Text SIP Session Initiation Protocol SMS Short Message Service TTS Text-To-Speech UAC (SIP) User Agent, Client side UAS (SIP) User Agent,
43、 Server side 4 Evolving enabler technologies and user requirements 4.1 From local availability to mainstream integration Information and Communication Technologies (ICT) play a central role in the everyday life of an ever-increasing number of people. Conventional fixed-line text telephone services p
44、rovide considerable communication benefits to many people with hearing and/or speech impairments and are still used by these groups in several European countries. This technology has traditionally required the use of a fixed PSTN landline for text telephone terminal access, provided from a certain l
45、ocation (typically in the home or workplace), using robust modem technology (supporting alternation between voice and text during the call) from the 1970s. Most users of these services also have a clear need and preference for real-time text communication (RTT) when on the move, with support for add
46、itional communication services - such as the capability to communicate with other text telephones or get access to emergency services. Mobility has become an increasingly important user requirement, due to changing demographics and habits and has been strengthened by the capabilities offered through
47、 modern ICT technologies i.3. Young people, including those with functional hearing limitations, expect full access and functional equivalence to what voice users have through mainstream technologies (e.g. mobile communication devices using mobile networks, offering Internet access). The maturity an
48、d capabilities offered by mobile systems and devices evolve continuously and considerable progress has been achieved with regard to the user experience and accessibility attributes of these services. Devices with increasingly advanced capabilities, operating over mobile networks with instant access
49、to the Internet and the Web, in combination with ever-increasing penetration, enable the development and uptake of a new generation of mobile and IP-based services. Smartphones, tablets and their apps are fast becoming the preferred communication device of many users i.3. The mobile industry has developed the necessary specifications for the integrated support of real-time communication services over emerging mainstream technologies, e.g. IETF RFC 4103 i.11 and ETSI TS 126 114 i.8. IP based real-time text services based on I
