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CoolTalk was an Internet telephony utility in the form of a plug-in for Netscape Navigator 3.0. Launched in 1996, CoolTalk included an answering machine and a shared white board.
CoolTalk was among the first voice over Internet Protocol (VoIP) software products. Meant to be widely used among Internet users, CoolTalk was designed to run on cross-platform operating systems. Thanks to CoolTalk, statistics about VoIP users became available, contributing to the advancement of later VoIP software products.