Ultratec Uniphone 1150, User Manual

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VCO CALLING VCO CALLING
People who cannot hear but wish to speak for themselves can make voice
carry-over (VCO) calls. During a VCO call one person speaks into the
handset while the other person types on a text-telephone keyboard. The
Uniphone 1150 is ideal for VCO calling, because it combines a telephone
and a text telephone into one unit.
You can make VCO calls in Baudot, EDTN, CCITT, and Turbo Code codes.
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C H A P T E R