4A community that promotes fair and comprehensive access to advanced information and communication services for all citizens must ensure that those citizens whose disabilities are such that they cannot use devices “designed-for-all” are not excluded from the common access policies.
5In principle, all citizens expect to have access to information through technology mediated services and devices. In the context of this report, this implies that all citizens can choose to have access through mobile platforms, and to choose the complexity of the devices and the range of services that meet their needs, at reasonable and equitable costs.
6Some users with disabilities, however, are unable to use conventional devices and services, even those designed according to the “design-for-all” principles, as their disabilities are too severe or their requirements conflict with those of people with a different disability. In this case, these users should be able to choose the communication devices that they need to use, and to easily and cheaply enhance those devices and services with an adaptation appropriate to their needs. Examples could include a speaking output adaptation for blind people or icon representation of functions for people with reduced reading skills.
7In order for this objective to be realised, communication devices and services should be implemented with a standardized set of interfaces that can be the channel through which these adaptations become integrated with the rest of the system. Without this standardized interface, each adaptation will require significant technical expertise and effort, and will consequently be expensive and practically unrealistic. People with disabilities will be confined to using a small subset of the available devices and services, and will not be able to join other citizens in selecting devices and services according to personal preferences (e.g. style, design, functionality), but instead will have to persist with using specific devices long after they have ceased to be supported by manufacturers and operators, simply because it is impossible to replace them.
8A standardized set of interfaces will, therefore, encourage growth in the market for communication devices and services by enabling the large numbers of disabled and elderly people who are currently excluded to participate, and the strength of the rehabilitation technology market, particularly the small and medium enterprises that currently dominate this sector.
9As one candidate technology that is present in all communication devices is AT commands, the work to promote increased accessibility and adaptability of the communication devices is expected to include the upgrading of existing standards where the necessary AT commands [6, 7] do not exist (as recommended in "Requirements for assistive technology devices in ICT", ).
10Requirements on this set of interface standards have been collected in a process which has involved manufacturers of external devices and groups representing the user with different special needs. The results have been presented to appropriate standards fora and mainstream communication device manufacturers.
This Recommendation builds upon the current Asynchronous DCE control Recommendation ITU-T V.250, to include The present document specifies recommendations for AT command protocols that can be usedto support the interfacing of to enable external Assisitive Controlling Ddevices to interwork satisfactorily with communication devices over a range of suitable serial binary data interfaces.
The following ITU-T Recommendations and other references contain provisions, which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published.
The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation.
The following documents contain provisions, which through reference in this text, constitute provisions of the present document.
ITU-T V.250: "Serial asynchronous automatic dialling and control".
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity.
 ETSI EG 202 421: "Human Factors (HF); Multicultural and language aspects of multimedia communications".
 ETSI EG 202 116: "Human Factors (HF); Guidelines for ICT products and services; Design for All".
 ETSI EG 202 325: "Human Factors (HF); User Profile Management".
 ETSI TS 101 369: " Digital cellular telecommunications system (Phase 2+); Terminal Equipment to Mobile Station (TE-MS) multiplexer protocol (3GPP TS 07.10 version 7.2.0 Release 1998) ".
 ETSI TS 127 007: "Technical Specification Group Core Network and Terminals; AT command set for User Equipment (UE) (3GPP TS 27.007 Release 7)".
 ETSI TS 127 005: "Technical Specification Group Core Network and Terminals; Use of Data Terminal Equipment - Data Circuit terminating Equipment (DTE - DCE) interface for Short Message Service (SMS) and Cell Broadcast Service (CBS) (3GPP TS 27.005 Release7)".
 ETSI TS 122 226: "Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Global text telephony (GTT); Stage 1: Service description (3GPP TS 22.226 version 6.0.0 Release 6)".
 ETSI TS 26.114: "IP Multimedia Subsystem (IMS); Multimedia telephony; Media handling and interaction (3GPP TS 26.114)".
 ETSI TS 101 267: "Digital cellular telecommunications system (Phase 2+); Specification of the SIM application toolkit for the Subscriber Identity Module - Mobile Equipment (SIM - ME) interface (GSM 11.14)".
 ETSI TS 131 111: "Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Universal Subscriber Identity Module (USIM) Application Toolkit (USAT) (3GPP TS 31.111 version 7.5.0 Release 7)".