VoIP and IP PBX are terms that we use all the time, but despite similarities, they are not interchangeable. VoIP has evolved to be a very broad term covering a whole range of technologies, while IP PBX is more specific.
VoIP – Voice over Internet Protocol – describes any telephony system that uses Internet rather than PSTN. The term is used for many types of modern telephony that have replaced legacy systems.
IP PBX – Internet Protocol Private Branch Exchange – is a specific type of telephony system that switches calls between an internal data network and external networks.
IP PBX is a type of VoIP system.
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