I've been hearing-impaired, not quite since birth, but I've been wearing hearing aids since I was 13, so I'm very conscious of the difficulty of voice communication.
Vinton CerfWhat is special about VOIP is that it's just another thing you can do on the Internet, whereas it is the only thing - or nearly the only thing with the exception of the dial-up modem and fax - that you can do on the public switched telephone network.
Vinton Cerf