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Computing (FOLDOC) dictionary
IP Telephony
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communications (IPT, Internet Telephony) Use of IP data
connections to exchange voice and fax data that have
traditionally been carried over the public switched telephonenetwork.
During the late 1990s, an increasing number of telephone calls
have been routed over the Internet. Calls made in this way
avoid PSTN charges. Unlike traditional telephony, IP
telephony is relatively unregulated.
Companies providing these services are known as InternetTelephony Service Providers (ITSPs). They include telephone
companies, cable TV companies and Internet Service Providers