Adjustable coding detection in a portable telephone

Alarm system providing multiple network routing, interface...

Apparatus and method for converting text being streamed to a...

Apparatus and method for providing service for TTY and voice...

Apparatus and method for transitioning between TTY and voice...

Audio and data communications system

Audio/telecommunications system to assist in speech and cognitiv

Automated communications assistant for the sound-impaired

Automated dual-party-relay telephone system

Automated interactive telephone communication system for TDD use

Automated telephone system using multiple languages

Automated telephone system with TDD capability

Automatic configuration of call handling based on end-user...

Automatic processing of calls with different communication modes

Call center for handling video calls from the hearing impaired

Call center for handling video calls from the hearing impaired

Captioned telephone service

Captioned telephone with emergency access feature

Chronological telephone system

Combination telephone and alphanumeric entry device