An Internet Phone
is a special voice over IP
) terminal that is designed to be used over the Public Internet
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.