Virtual Private Branch Exchange (VPBX)
Definition - What does Virtual Private Branch Exchange (VPBX) mean?
A virtual private branch exchange (VPBX) is a business phone system that provides call routing, follow-me calling, voice mail, fax and automatic call distributor queues delivered over the public-switched telephone system.
VPBX offers a communication solution optimized to address the requirements of dynamic businesses using the latest IP technology. Unlike a traditional private branch exchange (PBX), businesses do not need to purchase or install special equipment because VPBX is run through software.
Virtual private branch exchange is also known as Centrex.
Techopedia explains Virtual Private Branch Exchange (VPBX)
But while virtual PBX is a cost effective system, it's still a one-way alternative to a PBX system. Although it provides most of the features of a typical PBX system, it is only applicable for inward or inbound calls. Outbound calls can’t be made through this system.
Virtual PBX is provided by a telecommunications operator, Internet service provider and generally requires both a public switched telephone network and VoIP infrastructure to operate. Some of the features virtual PBX provides include call receiving, forwarding and routing, back-end music/message on hold, auto-attendant, voice mail etc.