Patent ID: 7672443

Claim:
A method for determining routing for virtual private network (VPN) numbers, comprising: receiving a query from a switch module to determine routing information for a call initiated by a calling party, the query including dialed digits, a nature of address (NoA) attribute, and a calling party identifier; determining whether the dialed digits include a VPN coding identifier; modifying the NoA attribute to a private type code when the dialed digits include the VPN coding identifier; selecting a private VPN number look-up table from a plurality of private VPN number look-up tables based on the calling party identifier, the plurality of private VPN number look-up tables associated with different VPN groups; looking up the routing information associated with the dialed digits in the selected private VPN number look-up table when the NoA attribute comprises the private type code; and transmitting the routing information to the switch module, the routing information comprising the NOA attribute.