What is IP Telephony?
Internet Protocol (IP) telephony describes technology that uses the IP protocol to exchange voice, fax, and other forms of information once transmitted only over the Public Switched Telephone Network (PSTN). The call travels as data and is carried over a Local Area Network (LAN), or the Internet, bypassing traditional PSTN charges. This technology was first introduced in the mid 1990s and has since completely changed the telecommunications industry. Today, IP is the most commonly used method for transmitting data communications and all communication carriers use an IP infrastructure for some, if not all, of their voice services.
An IP Private Branch Exchange (PBX) is a complete telephony system that provides voice calls over IP data networks. This system is robust and scalable, making it the most popular system for companies of all sizes. IP PBX systems can connect to traditional PSTN lines and switch between VoIP and tradition systems making integration simple, allowing a company to keep their regular telephone numbers.