Virtual PBX has the same functionalities as traditional PBX, for example, internal calls, call transference, teleconference and voice mail, as a service affordable from the Internet or from the Public Switched Telephone Network
The functionalities of a virtual PBX are similar to those of physical IP PBXs. The main difference is that virtual PBXs are hosted on the web, so the user does not need to buy, install and maintain a physical PBX.