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Internet Protocol (IP) telephony (also known as Voice over Internet Protocol, VoIP), is a telephony system in opposition to traditional telephone community technologies. As of January 2005, up to 10% of telephone subscribers in Japan and South Korea have switched to this digital telephone service.
Virtual PBX is a privately held communications service provider or also known as a virtual or hosted PB. A business makes use of PBX exchange to handle telephone services equivalent to name routing, allowing a couple of person to be reached from a single line, voicemail, faxing, automated greetings, conference calling, and sending phone calls to a particular person in a department.