Voice over Internet Protocol or VOIP. Technology that allows you to transmit voice calls as digital data packets through IP networks rather than use the traditional method that sends analog signals sent along the Public Switched Telephone Network (PSTN). Placing a VoIP call can be performed with a regular phone, special IP phones, or mobile devices. In fact, most long-distance calls from traditional carriers are now VoIP calls.
Voice over Internet Protocol (VoIP), also called IP telephony, is a method and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. The terms Internet telephony, broadband telephony, and broadband phone service specifically refer to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN), also known as plain old telephone service (POTS).