Patent ID: 7809123

Claim:
A switch control point comprising: a memory to store a private-number table; and a control element to control a call originated via a private branch exchange (PBX) by a first user of a plurality of users associated with a virtual private network (VPN) by: determining whether the call from an originating station associated with the first user originated via integrated services digital network (ISDN) access to the VPN; when the call originated via the ISDN access, querying the private-number table based on a switch identifier for a signal switching point, a trunk group identifier for the PBX, and an Originating Station Number (OSN) associated with the originating station to obtain a private number assigned to the first user; identifying an authorization level associated with the private number; and providing the authorization level to the signal switching point, the signal switching point to process the call according to the authorization level.