A program to communicate with phone TTY/TDD devices (Telecommunications Devices for the Deaf) via a sound card, without TTY modem. A simple interface between sound card and phone line or acoustic connection with phone handset are used. Together with "Virtual Audio Cable" software CallTTY can work via Skype Internet-phone, without additional hardware at all.

CallTTY TDD software is the Shareware version. The full version can be purchased by clicking on the "CLICK HERE TO ORDER" button below for around 25USD.