Voice Over IP

Voice over Internet Protocol (VoIP), also called IP telephony, is a method and set of technologies for the transfer 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 specially submit to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than through the public switched telephone network (PSTN).