The Ameriphone Q90D combines a digital TTY/VCO with a text answering machine. It connects to TSB-121 compatible cell phones for TTY calls. You can also use the built-in microphone for Voice Carry Over (VCO) calls. It allows those with hearing impairments or speech difficulties to communicate on their cell phone, on two TTYs using a Relay Service, or on VCO or HCO calls.
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