telecommunications device for the deaf

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tel·e·com·mu·ni·ca·tions de·vice for the deaf

(TDD, TT) (tel'ĕ-kŏ-myū'ni-kā'shŭns dĕ-vīs' def)
Telephone accessory that transmits and receives text over standard telephone lines. Also referred to as teletypewriter (TTY) and text telephone (TT).
See also: assistive listening device
References in periodicals archive ?
She added: "Communicating with the ScreenPhone has been an enormous improvement over the previous 23 years with a textphone.
The mobile textphone is available from Vodafone and enables deaf individuals to make calls via a keyboard and display screen.
The businesses to be divested included Corporate Services Fleet Manager and its text telephony unit Mobile TextPhone.
To order your free copy ring: 0345 622 633 (BT calls charged at local rate), or textphone 0345 622 644.
The consultation will close on November 1 and submissions can be made during the consultation via the Customer Helpline on 03457 22 33 44 or Textphone 03457 22 33 55.
uk, or via the Customer Helpline 08457 22 33 44, or textphone 08457 22 33 55.
To report benefit fraud call 0800783 1030 or textphone 0800 328 6341 or email bit@lichfielddc.
There is also a textphone service on 0808 808 0121.
At the same time, we are also committed to supporting them, particularly those with mobility difficulties, and our Journey Care helpline is available to assist customers with their travel arrangements (Tel 0845 300 3005 or Textphone 0845 6050600).
To find out, call the Benefit Enquiry Line, a confidential Freephone for disabled people and carers, on 0800 882200 or textphone 0800 24 33 55 and ask for a claim pack.