What is VoIP? Voice over Internet Protocol takes us away from the traditional office PBX, the on-location physical equipment that provides voice telephony using physical wires or fiber to transmit analog signals. PBX technology allows for some audio conferencing (though it can be a bit clumsy to set up) as well as voicemail, call forwarding, and some other call sorting features. However, a PBX has some severe limitations on available collaboration features and requires a trained technician to configure any changes. Even moving someone to a new office requires expensive and technical labor to move the extension to a different physical location.