In the US
STS Relay is available via 711 in the US through the Telecommunications Relay Service; in a telephone call, first dial 711, then ask for STS. A trained communication assistant will ask you what number you want to call. The assistant will repeat what the caller with the speech disability is saying. The callee can then respond. The caller can then reply. The communication assistant will revoice the caller's message. The callee then responds in this three-way assisted phone conversation.
In other countries
The service is available in Australia, Sweden, and in other nations on a trial basis. STS Relay on the PSTN (public switch telephone network) is available for those who need telephone call assistance because of a speech disability.
STS Relay first became available in the US in California, in 1997; the service became available nationally March 1, 2001.
DrSTS@comcast.net—this email address is intended for the use of those who need information on how to use Speech to Speech on the telephone in their daily lives