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An IP PBX or  VOIP phone system replaces a traditional PBX or phone system, giving employees the ability to make mobility, voice and video calls with one single line and make free calls to colleagues using VoIP.

All calls are sent as data packets over a data network instead of the traditional telephone network. You  can connect existing phone lines to IP PBX using a VoIP gateway, and make and receive phone calls with a regular PSTN line. IP PBX, SIP and VoIP FAQ ; It helps answer general questions about VoIP ,  SIP , IP PBX / VoIP Telephony hardware and software, applications and more...

More info @  Best voip service providers