Voice over Internet Protocol (VoIP, IPA: /vɔɪp/) is a general term for a family of transmission technologies for delivery of voice communications over the Internetpacket-switched networks. Other terms frequently encountered and synonymous with VoIP are IP telephony and Internet telephony, as well as voice over broadband, broadband telephony, and broadband phone, when the network connectivity is available over broadband Internet access. or other
VoIP systems usually interface with the traditional public switched telephone network (PSTN) to allow for transparent phone communications worldwide[1].
VoIP can be a benefit for reducing communication and infrastructure costs by routing phone calls over existing data networks and avoiding duplicate network systems. Skype and Vonage are notable service provider examples that have achieved widespread user and customer acceptance and market penetration.
Voice-over-IP systems
Source : http://en.wikipedia.org/
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