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Implementation alternatives



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188.919.13.1 Implementation alternatives

188.92It could be implemented by both AT command and OBEX, which could benefit a wider range of external devices. AT commands is ASCII oriented, whereas OBEX could send the picture in various formats (e.g. jpeg, bmp) which would be more efficient than sending it using ASCII. Also, the pictures could be sent via Bluetooth, for example via the Basic Imaging Profile.

188.939.14 Speech-to-text


The ability of a mobile phone to convert speech-to-text would enable persons who are visually impaired or blind to easily enter text.

Recommendation 9.14: The communication device shall provide an interface with the necessary AT command to allow an external device to enable speech-to-text on their communication device.



Table E.12: +CSTT parameter command syntax

+CSTT command with sub-command

Command

Possible response(s)

Execution command:

+CSTT=

+CSTT: OK

+CSTT ERROR:



Read command

+CSTT?

+CSTT:

Test command

+CSTT=?





Description

The +CSTT command enables speech-to-text.



Defined values

:

0 Speech-to-text off

1 Speech-to-text on

188.949.15 Text telephony


Users who are hard of hearing or deaf have traditionally used text telephony for communicating by typing text. Text telephony on an external device would provide users who are hard of hearing or deaf with a familiar and convenient way to communicate, especially when video telephony for some reason is not an option.

188.94.1Recommendation 9.15: The communication device shall provide an interface with the necessary AT command to allow an external device to communicate using real time character by character text. [3, 31]

188.94.2

188.94.39.15.1 Sending text


Table E.13: +CSTXT parameter command syntax

+CSTXT command with sub-command

Command

Possible response(s)

Execution command:

+CSTXT=



+CSTXT: OK

+CSTXT ERROR:



Unsolicited result code:

+CSTXT=




Test command

+CSTXT=?





Description

In text mode, characters entered during the recommended time span of 300 ms are sent in UTF-8 encoded Recommendation ITU-T T.140 format [17]. . Both the previously mentioned solutions send digital text according to ITU-T T140. If text is available in a call it is indicated through the unsolicited result code +CSTXT=.



Defined values

:

1 real-time text according to IMS.

2 text telephony over the voice channel and digitally.

188.94.49.15.2 Receiving text


Table E.14: +CRTXT parameter command syntax

+CRTXT command with sub-command

Command

Possible response(s)

Unsolicited result code:

+CRTXT=



+CRTXT: OK

+CRTXT ERROR:




Description

In text mode, characters are received in Recommendation ITU-T T.140 format [17].


188.94.59.15.3 Setting preference for real-time text


Table E.15: +CRTXT parameter command syntax

+CRTXT command with sub-command

Command

Possible response(s)

Execution command:

+CRTXT=

+CRTXT: OK

+CRTXT ERROR:



Test command

+CRTXT=?





Description

Indication to the network if the real-time text medium shall be set up or not (if it is available).



Defined values

: Preference for real-time text.

1 on


0 off

188.959.15.4 Implementation

188.96The implementation of text telephony can be done in two ways:

    1. through a mix of transfer over the voice channel and transfer digitally as suggested in 3GPP TS 22.226 [8].



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