Voice Over Internet Protocol
The possibility of voice communications traveling over the Internet, rather than
the PSTN, first became a reality in February 1995 when Vocaltec, Inc. introduced
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its Internet Phone software. Designed to run on a 486/33-MHz (or higher)
personal computer (PC) equipped with a sound card, speakers, microphone, and
modem (see Figure 1), the software compresses the voice signal and translates it
into IP packets for transmission over the Internet. This PC-to-PC Internet
telephony works, however, only if both parties are using Internet Phone software....
