Text over IP (ToIP)

Text over IP (ToIP), also known as Real-Time Text (RTT), is a means of sending text in real-time over IP network within the context of a multimedia session.

This technology was originally designed to meet the needs of the deaf and hard-of-hearing users who rely on text communication as a part of normal daily communication. The idea originated with legacy telephony devices that had an accoustic coupler that would allow a user to send text over PSTN networks using one of several protocols like Baudot.

Resources: VoIP Information Site, RFC 4103, TTY Basics

See Also: Voice over IP (VoIP), IP Telephony (IPTel)