Typically, it uses the Session Initiation Protocol (SIP) or Media Gateway Control Protocol (MeGaCo[?]).
Most regular voice over IP phones can be used as Internet phones with a little tweaking, but first-generation Internet Phones like the PingTel[?] Expressa have been on the market since 2001.
Second-generation Internet Phones are expected to have features like:
Companies like Cisco Systems, Inc. and SocketIP[?], among others, are expected to release second-generation Internet Phone platforms in 2002.
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