Thus, the bandwidth requirement for voice on an IP network is 1/16th that of the PSTN's dedicated, digital circuits. Starting in the mid-1990s, advertiser-supported, free telephone service from PC ...

"Telecommunication services using IP telephony are not being banned and will continue to be provided. A telephone communication service license is required for this. For most legitimate operators, ...

The primary IP telephony signaling protocols are H.323, SIP and MGCP/MEGACO. There are also proprietary protocols; for example, Cisco's Skinny is widely used. See IP telephony. THIS DEFINITION IS ...