IP captioned telephone service uses which medium to provide the link and captions between the caller with a hearing disability and the communications assistant (CA)?

• A. Internet
• B. Telephone network
• C. Satellite link
• D. Cellular network

Answer: (A)

IP captioned telephone service uses the Internet as the link between the caller and the communications assistant. The caller’s speech is transmitted over IP to the CA, who provides real-time captions that are sent back over IP to the caller. This setup relies on Internet Protocol rather than the traditional telephone network, allowing captioning to work across various devices and connections. While cellular devices can access the Internet, the defining medium for IP CTS is the Internet itself, not the PSTN, a satellite link, or a standalone cellular channel.