36 CFR Part 1194 - Proposed Information and Communication Technology (ICT) Standards and Guidelines NPRM - Preamble
410.6.3.1 PSTN (Section-by-Section Analysis)
This section proposes that, where ICT with real-time two-way voice communication interoperates with the publicly switched telephone network (PSTN), real-time text conform to TIA 825-A (incorporated by reference in 508 Chapter 1 and 255 Chapter 1). This is the current industry standard for TTY signals (also known as Baudot) at the PSTN interface.
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