Cellular text telephone modem; Transmitter bit exact C-code
This Technical Standard (TS) contains an electronic copy of the ANSI‑C code for the Cellular Text Telephone Modem (CTM) for reliable transmission of text telephone  text via the speech channel of cellular networks. While CTM is generally usable with text in UCS coding, the example application linked to CTM in this document is limited to use the signals and character set of the Baudot type.