Why IPtext only on IP networks -- cont'd
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Allows anyone to supplement speech with text in a call.
VERY IMPORTANT FOR CLEAR COMMUNICATION
WITH HoH CALLER
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Allows mixing of text and video and voice at will during call.
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Allows interruption or even parallel talk.
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Allows TTY (Baudot) to eventually fade with Analog network. (TTY like devices may continue -- but would be IPtext based with all advantages.)