by 
The Curious Bag
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A PBX, or private branch exchange, is a system that controls phone lines. A virtual PBX is simply a computer and software program that controls your phone lines rather than an actual PBX box.
Identification
A virtual PBX connects incoming lines to a computer system, then routes the information based on the software controlling the system. All information such as extensions, user status and voice mail are entered using this software.
Features
Because of its size, a virtual PBX is easily transferable. It has all of the features and functions of a localized phone bank, including call forwarding, call transfer, voice mail and conference calls.
Connections
A virtual PBX connects multiple incoming lines to multiple phone extensions. The features and functions are controlled by the software installed on the VPBX.
Variations
A recent innovation to the virtual PBX is the mobile PBX, which provides the same services for mobile phones.
Keep In Mind
A virtual PBX is run through an Internet connection and is directly affected by your upload/download speeds. If you want to use a VPBX, test your Internet connection to make sure there is sufficient speed.
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