A program to communicate with phone TTY/TDD devices via a sound card or Skype
EditByBSEditor: 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. you can free download CallTTY 2.30 now.