Method of operating a virtual private network

• US 7,356,138 B2
• Filed: 01/26/2007
• Issued: 04/08/2008
• Est. Priority Date: 11/13/1997
• Status: Expired due to Fees

• Current Assignee: SBC Properties, L.P. (AT&T, Inc.)
• Original Assignee: SBC Properties, L.P. (AT&T, Inc.)
• Inventors: Malinowski, Walter Martin, LeBeau, Christopher Michael, Tiliks, Dianna Inara, Heinmiller, Wayne Robert, Moss, John Wesley, Madoch, Pitsa
• Primary Examiner(s): Hong; Harry S.
• Application Number:
  US11/627,788
• Publication Number:
  US 20070121610A1
• Time in Patent Office: 438 Days
• Field of Search: 379/207.02, 379/219, 379/220.01, 379/221.01, 37922108-2211, 379/221.15, 379/229, 379/230, 379/901
• US Class Current: 379/220.01
• CPC Class Codes: H04L 12/4641 Virtual LANs, VLANs, e.g. virtual private networks [VPN] LAN interconnection over a bridge based backbone H04L12/462; encapsulation techniques H04L12/4633; routing of packets H04L45/00; packet switches H04L49/00; virtual private networks for security H04L63/0272
• CPC Class Codes: H04M 2207/12 intelligent networks
• CPC Class Codes: H04Q 3/0029 Provisions for intelligent networking
• CPC Class Codes: Y10S 379/901 Virtual networks or virtual private networks

Abstract

A method of operating a virtual private network includes the steps of: (a) dialing a custom number; (b) receiving the custom number at a switch (20) of a first carrier; (c) routing the call to a switch (18) of a second carrier based on having received the custom number; and (d) when the call to the switch (18) of the second carrier includes a plain old telephone number translation of the customer number, routing the call over the second carrier to a service switching point (26) of a third carrier.

Claims

1. A method of operating a virtual private network, comprising:

receiving a dialed number at an originating carrier;

performing a number identifier operation based on the dialed number without contacting a service control point to determining whether a call should be routed on a private line to an intermediate carrier switch;

when the call is routed to the intermediate carrier switch over the private line, sending a query including the dialed number from the intermediate carrier switch to a network carrier service control point;

receiving a message containing a routing instruction including a plain old telephone number translation of the number; and

routing the call based on the routing instruction.

2. The method of claim 1, further comprising:

receiving the call at an intermediate switch;

routing the call to a terminating service switching point.

3. The method of claim 2, wherein routing the call to the terminating service switching point comprises routing the call over a private line.

4. The method of claim 2, wherein routing the call to the terminating service switching point further comprises:

triggering on the plain old telephone number at the intermediate switch;

sending a routing query to a second service control point;

checking if a calling telephone number and the plain old telephone number belong to a same private network;

when the calling telephone number and the plain old telephone number belong to the same private network, routing the call from the intermediate switch over a private line to the terminating service switching point.

5. The method of claim 1, wherein the dialed number has less than seven digits.

6. The method of claim 1, wherein performing the number identifier operation based on the dialed number without contacting a service control point comprises comparing the dialed number to a set of numbers.

7. A method of operating a virtual private network, comprising:

receiving a number to initiate a call at a first local access and transport area (LATA) of a first carrier;

performing a number identifier operation based on the dialed number without contacting a service control point to determining whether a call should be routed on a private line to a switch of an intermediate carrier switch;

routing the call over the private line to the switch of the intermediate carrier; and

routing the call over a private line from the intermediate carrier to a terminating carrier in a second LATA.

8. The method of claim 7, wherein routing the call over the private line from the intermediate carrier to the service switching point of the terminating carrier further comprises:

determining whether received routing instructions include a signaling indicator; and

when the routing instructions include the signaling indicator, routing the call over the private line.

9. The method of claim 7, wherein routing the call over the private line from the intermediate carrier to the terminating carrier further comprises:

sending a query to a service control point;

determining whether a plain old telephone number corresponding to the dialed number and a calling party telephone number belong to a virtual private network; and

when the plain old telephone number and the calling party telephone number belong to the virtual private network, routing the call over the private line.

10. The method of claim 7, wherein the second LATA is of a second carrier and the intermediate switch is of a third carrier.

11. A method of operating a virtual operating network, comprising:

receiving a custom number at a first switch of a first carrier;

performing a number identifier operation at the switch of the first carrier based on the dialed number without contacting a service control point to determining whether a call should be routed on a private line;

routing the call on the private line; and

when the call reaches a second switch of a second carrier with a plain old telephone number translation of the custom number, routing the call to a service switching point of a third carrier.

12. The method of claim 11, further comprising:

when the call reaches the second switch of the second carrier without the plain old telephone number translation of the custom number;

sending a query to a network service control point; and

receiving a routing instruction including the plain old telephone number translation of the custom number.

13. The method of claim 12, further comprising routing the call based on the plain old telephone number to a third switch of the second carrier;

wherein, when the call is received at the third switch with a signaling indicator, the call is routed from the third switch over a private line to the service switch point of the third carrier.

14. The method of claim 13, further comprising:

when the call is received at the third switch without the signaling indicator, determining if a calling number and the plain old telephone number belong to a private network without contacting a service control point; and

routing the call from the third switch over the private line to the service switch point of the third carrier when the calling number and the plain old telephone number belong to the private network.

15. The method of claim 11, wherein the custom number includes less than seven digits.