ETSI TR 102 575 V1.1.1 (2013-11)

Human Factors (HF); IP-based text telephony - as deployed in Scandinavia (and in some other countries)

DTR/HF-00107

General Information

• Status: Published
• Publication Date: 04-Nov-2013
• Technical Committee: HF - Human Factors
• Current Stage: 12 - Completion
• Due Date: 13-Nov-2013
• Completion Date: 05-Nov-2013

Standards Content (Sample)

ETSI TR 102 575 V1.1.1 (2013-11)






Technical Report
Human Factors (HF);
IP-based text telephony - as deployed in Scandinavia
(and in some other countries)

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2 ETSI TR 102 575 V1.1.1 (2013-11)



Reference
DTR/HF-00107
Keywords
HF, IP, mobile, telephony, terminal, text
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3 ETSI TR 102 575 V1.1.1 (2013-11)
Contents
Intellectual Property Rights . 4
Foreword . 4
Introduction . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definitions and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 7
4 Evolving enabler technologies and user requirements . 7
4.1 From local availability to mainstream integration . 7
4.2 Generic, context-specific user requirements. 8
5 Technical details . 9
History . 10

ETSI

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4 ETSI TR 102 575 V1.1.1 (2013-11)
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 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 (http://ipr.etsi.org).
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 present document.
Foreword
This Technical Report (TR) has been produced by ETSI Technical Committee Human Factors (HF).
Introduction
ICT-mature and experienced end users often wish to extend the reach of their text communication services 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 supporting 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 and 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 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 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 the device identity of the counterpart is assured.
ETSI

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5 ETSI TR 102 575 V1.1.1 (2013-11)
1 Scope
The present document provides a description of user, functional and some technical aspects of an IP-based text
telephony service, supporting the use of fixed and mobile mainstream devices, as currently deployed in Scandinavia
(Denmark, Finland, Norway and Sweden - known as "Reliable RTT") and some additional countries (such as Germany
and the Netherlands).
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 interested in the service.
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 service described.
2 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 (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 hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
Not applicable.
2.2 Informative references
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& Telecommunications 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); Harmonized relay services".
[i.3] ETSI TR 102 548: "Human Factors (HF); User Experience; 3G and Mobile Broadband
Interoperability Plugtest: Approach, scenarios and test specification; Outcomes, conclusions and
recommendations".
[i.4] ETSI/CEN/CENELEC DEN 301 549: "Human Factors; Accessiblity requirements suitable for
public procurement of ICT products and services in Europe".
[i.5] ETSI EG 202 416: "Human Factors (HF); User Interfaces; Setup procedure design guidelines for
mobile terminals and services".
[i.6] ETSI EG 202 417: "Human Factors (HF); User education guidelines for mobile terminals and
services".
[i.7] ETSI EG 202 423: "Human Factors (HF); Guidelines for the design and deployment of ICT
products and services used by children".
ETSI

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6 ETSI TR 102 575 V1.1.1 (2013-11)
[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 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: "RTP Payload for Text Conversation", June 2005.
[i.12] IETF RFC 3428: "Session Initiation Protocol (SIP) Extension for Instant Messaging".
[i.13] Swedish Post and Telecom Authority: "Örebro Läns Landsting - Psykiatri och Habilitering:
"Försöksprojekt FLEXITEXT - Flexibel texttelefoni" (in Swedish; in translation: "Örebro County
Council: The FLEXITEXT trial project - Flexible text telephony").
NOTE: Available at http://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 facilities 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 (from ISO 26800 [i.10])
NOTE 1: Context of use includes direct use or use supported by assistive technologies.
NOTE 2: The context in which the ICT is used may affect its overall accessibility. This context could include other
products and services with which the ICT may interact.
real-time text: form of text conversation in point to point situations or in multipoint conferencing where the text being
entered is displayed 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 that 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 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: telecommunications service that enables text telephone users and voice telephone users to interact
by providing conversion
...