This page scrapbooks links to text phones found searching EDT - European Deaf Telephone.
I suppose I have a Textphone Spotting hobby
The browser's ability to translate really helps me!
Some Textphones - :-
Ultratec supply many models of textphones. You seem to need to set the code.
There are many confusing codes used , this is my best guess.
| CODE | ITU modem | ITU V.18 Annex |
| BAUDOT | BAUDOT @ 45.45 baud | Annex A |
| INTERNATIONAL | BAUDOT @ 50 baud | Annex A |
| CCITT | ITU V.21 | Annex F |
| ASCI | BELL103 | Annex D ? |
| EDT | ITU V.21 @ 110 baud | Annex C |
Here are some images of text phones.
This only has a phone lead to plug into the PSTN, and you can plug a phone in the back for VCO.
The TextLink? 9100 Mobile is a version you can plug the audio into a Mobile phone using 2.5mm / 3.5mm cable.
This version does not have a phone line, you have to use the Acoustic coupler.
This version does not have a phone line, you have to use the Acoustic coupler. From 1994 ROM: "cp uk 030394"
These use V.21 7 bit ascii. They support typing using an optional PC keyboard that has the PS/2 din connector.
They dropped characters if the MSB was set.
Ultratec supply many models of textphones.
https://www.sri.com/press/story/75-years-of-innovation-acoustic-modem/
https://sfpl.org/locations/main-library/deaf-services/deaf-services-center-history-and-photographs
Ameriphone Q90D TTY w/ VCO & HCO
https://www.robkalmeijer.nl/techniek/telecom/telefonie/index.html - super link
https://hoereforeningen.dk/hjaelp-til-dig/hjaelpemidler/andet-hjaelp-hverdagen/teksttelefoni
Telescrit
https://de-academic.com/dic.nsf/dewiki/1373425
https://de-academic.com/dic.nsf/dewiki/1257020
https://de.wikipedia.org/wiki/Schreibtelefon
https://www.radiomuseum.org/r/ecotron_fonotext_dts.html
ECOTRON Dts Pocket Textphone
https://signdna.org/get-in-touch/
https://signdna.org/object/119-o-wds/
https://hmi-basen.dk/blobs/produktblade/12574.pdf
https://cantec.no/horselteknisk/3821/3822 has these images:-
https://digitaltmuseum.no/011025208598/hjelpemid-funks-hemm
https://digitaltmuseum.no/011025208598/hjelpemid-funks-hemm/media?slide=0 - norwiegn
https://hrf.se/stockholmslan/om-oss/vard-och-stod/texttelefoni/
https://www.ghe.ch/admin/uploads/SpezifikationenDocs/5/Telescrit_2002,2108-d_oF.pdf -
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https://www.ofcom.org.uk/phones-and-broadband/phone-numbers/numbers-for-drama - Useful for testing. Dial one across RelayUK? and your will be told by Relay UK the number has not been recognised.
https://ddbeck.com/fictitious-numbers/
https://www.nxp.com/docs/en/data-sheet/MC145444.pdf
https://tap.gallaudet.edu/Text/TTYBasics.html - Brief History of TTY
https://de.wikipedia.org/wiki/Schreibtelefon - useful wiki page that explains the history.
The page above mentions the vistel 1 and teh science museum has this in the catalogue.
https://sfdh.org.uk/topic/technology/
EDT is an option in the IYU V.18 spec.
I did a search for European Deaf Telephone (EDT) and came up with some interesting links.
A spanish web page:-
A Norweigian web page:-
https://teksttelefon.no/static/informasjon-om-teksttelefonen.html
Really good Dutch webpage that has good phone diagrams and notes on DTMF used on some Textphones.
https://www.robkalmeijer.nl/techniek/telecom/telefonie/index.html
He has this diagram of a phone. You can see the Bell , hook switch, rotary dial, the Anti-sidetone hybrid Microphone and receiver with Anti- Acoustic shock diodes.
German examples:-
https://commons.wikimedia.org/wiki/Telecommunications_device_for_the_deaf?uselang=de
https://de.wikipedia.org/wiki/Schreibtelefon
Ultratec seems to be very popular in America. It does CCITT BAUDOT
https://oldcomputer.info/terminal/minicom/index.htm
https://www.wikiwand.com/en/articles/Telecommunications_device_for_the_deaf
https://deafwebsites.com/technology/telecommunications-devices-for-the-deaf/
pay phone with TTD
https://www.ghe.ch/admin/uploads/SpezifikationenDocs/6/Telescrit%202002,2008%20d%20neu.pdf
https://www.deafhistory.eu/index.php/component/zoo/item/1960-s-invention-of-the-text-telephone-tty
https://deafhistory.eu/index.php/component/zoo/item/1960-s-invention-of-the-text-telephone-tty
https://www.englishdbs.com/abbreviation/249999#google_vignette
In the UK -
https://www.relayuk.bt.com/ - The UK Relay site run by BT.
https://www.dspg.co.uk/products-services/accessibility/
https://www.dspg.co.uk/products-services/accessibility/end-user-solutions/textlink-9100-mobile/
https://www.britishtelephones.com/qwerty.htm -
https://en.wikipedia.org/wiki/Telecommunications_relay_service
RTTY - uses BAUDOT codes
Ultratec compact:-
https://www.weitbrecht.com/text-telephones/
https://askjan.org/products/Ameriphone-Q90D-TTY-w-VCO-HCO.cfm
https://vocal.com/voip/sip-analog-modem-server-sams-tty-tdd/
https://www.ultratec.com/about/timeline/
https://www.ultratec.com/about/timeline/
https://www.ultratec.com/products/text-telephones/
https://www.sjs-services.co.uk/product-page/uniphone-1150-textphone
https://livingmadeeasy.org.uk/product/uniphone-1150-textphone
https://www.ultratec.com/support/
https://www.ultratec.com/support/uniphone-series/
https://www.ultratec.com/support/ezcom-pro/
https://picclick.co.uk/Geemarc-Screenphone-Hard-Of-Hearing-Deaf-Phone-297600016971.html
https://northernacoustics.wordpress.com/category/textphone/
https://deaflibrary.org/v18/v18.html
GeeMarc? Screenphone Clear Sound Large Screen Voice & Text Telephone Deaf RNID
https://www.manualslib.com/manual/735105/Geemarc-Screenphone.html
https://www.manualslib.com/manual/2636874/Geemarc-Clearsound-Cleartext.html
https://www.deafax.org/news/golden-anniversary-of-the-first-telephone-call-between-two-deaf-people/
https://www.wikiwand.com/en/articles/Real-time_text - useful summary
https://tap.gallaudet.edu/Text/TTYBasics.html
https://askjan.org/products/Ameriphone-Q90D-TTY-w-VCO-HCO.cfm
https://vocal.com/voip/sip-analog-modem-server-sams-tty-tdd/
https://de.wikipedia.org/wiki/Schreibtelefon
https://en.wikipedia.org/wiki/Telecommunications_device_for_the_deaf
https://commons.wikimedia.org/wiki/Telecommunications_device_for_the_deaf?uselang=de
https://teksttelefon.no/text/#/login
https://teksttelefon.no/static/informasjon-om-teksttelefonen.html
https://www.robkalmeijer.nl/techniek/telecom/telefonie/index.html
https://oldcomputer.info/terminal/minicom/index.htm
https://abilitynet.org.uk/news-blogs/9-useful-apps-people-who-are-ddeaf-or-have-hearing-loss
https://elook.org/post/telecommunications-device-for-the-deaf/
https://deafwebsites.com/technology/telecommunications-devices-for-the-deaf/
https://www.historytools.org/people/emile-baudot-biography-history-and-inventions
https://www.dxatlas.com/Gritty/
https://www.rtty.com/England/fiveunits.htm
https://www.dxsoft.com/en/products/calltty/
https://freeserialportterminal.com/
https://www.virtual-modem.com/
http://www.whence.com/minimodem/minimodem.1.html
https://deramp.com/downloads/teletype/Model%2015/Teletype%20Baudot%20Codes.pdf
https://www.rtty.com/England/fiveunits.htm
https://telegrafistas.es/museo-postal-y-telegrafico/equipos-y-sus-creadores/426-morse%20BAUDOT
https://www.kcom.com/home/help/phone/text-relay-service/
https://www.ofcom.org.uk/phones-and-broadband/accessibility/text-relay-guide/
https://community.talktalk.co.uk/t5/Articles/Using-the-Text-Relay-Service/ta-p/2205168
The Ultratec Supercom only has the the acoustic coupler.
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I can use WebAudio to generate the modem tones.
https://www.dougrice.co.uk/webaudio/mic.htm can do BAUDOT using cheap ear buds from Poundland.
You need to mechanically mount the earbuds in a usable cradle.
See images on: https://www.dougrice.co.uk/webaudio/mic.htm
This image shows the webpage ready to use with the Phone. The earbud and microphone are mounted in the foam spounges. You dial the call on the phone and then place the handset on the washing up sponges.
I asked Gemini to draw me an acoustic coupler and it came up with some Stunning images, but technically missed the point.
This is one is a favorite
I asked the Gemini AI tool to draw me my idea of using Washing up pads to make an acoustic coupler, and got these amusing versions:-
You could test typing using a robot:
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