Digital cellular systems "digitize" a person's speech, compress the data, and reconstitute that speech at the receiving end of a telephone call -- can this be duplicated for TTY signaling tones?

Failure to consider needs during design phase of digital phone development results in industry resistance to retrofitting

September 1996 -- industry seeks reconsideration of FCC rule: says resolving problem within one year would be a "Herculean task;" urges short messaging services and use of analog phones