VoIP IS HOTTER THAN EVER.
From VoIP service providers to VoIP networking and systems manufacturers, the VoIP field is expanding more than ever before. Business organizations have discovered the huge cost savings that VoIP can provide. Whether it’s adding to or upgrading from a current PBX system, integrating a relatively low cost business VoIP system just makes sense.

VoIP - (Voice over Internet Protocol) is a category of hardware and software that enables people to use the Internet as the transmission medium for telephone calls.  Voice data is sent in packets using rather than by traditional POTS circuits. One advantage of VoIP is that the telephone calls over the Internet do not incur a surcharge beyond what the user is paying for Internet access, much in the same way that the user doesn't pay for sending individual e-mails over the Internet.
VoIP can also be used to carry voice traffic from a user to the PSTN. Traffic can be carried on each channel of a T-1 or DS-3 (1 call per channel) or all calls can be aggregated dynamically as packets on the circuit.  Calls are then transferred in a data center to the PSTN and their final destination.