US Patent 10587751 Captioned telephone service

A method of operating a captioned telephone call in which an assisted user is connected by a captioned telephone device that is connected both by a first line to a remote user and a second line to a relay providing captioning for a conversation, the method comprising the steps of: when a start of an incoming call is detected by the captioned telephone device on the first line, the captioned telephone device automatically calling the relay on the second line to initiate captioning service set up; the captioned telephone device passing spoken words received on the first line to the second line; and the relay then providing text captions of the spoken words back to the captioned telephone device on the second line.