A virtual voice network, Voice VPN, means several geographically distributed telephone networks integrated into a single network with a single Numbering Plan, which is relevant at all times.
Several remote telephone networks are integrated into a single corporate network, a Voice VPN, on the base of the NGN Comstar, in which case the telephones in the Virtual Network have single numbering, as if they were connected to the same private automatic branch exchange (PABX).
Voice VPN subscribers can call one another, and use local / national / international communications of guaranteed quality. Supplementary voice services, such as individual voice portals, IVR, instant messaging service, virtual call centers and others, are available to them. The subscribers can manage their personal services and specify a call handling algorithm through a simple web-interface.