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An Internet telephony service provider (ITSP) is an Internet service provider that supplies digital telecommunication service on Voice over Internet Protocol (VoIP). ITSPs provide direct Internet to users or other wholesale suppliers that consequently provide Internet to a home user. The service is based on local telephone and VoIP techniques, and thus it is facilitated by the Internet.
Internet telephony service providers are also known as voice service providers (VSPs).
An Internet telephony service provider uses the oldest method of connecting to the Internet — via local telephone connection attached to an analog adapter that is responsible for connecting to local service providers via a dial-up connection. This establishing of an Internet connection may use an IP phone, or may connect a private branch exchange (PBX) system to the service via media gateways.
An Internet telephony service provider makes use of a number of Internet protocols such as: