Offloading data traffic from facilities designed to handle voice call traffic

• US 7,352,850 B1
• Filed: 06/26/2002
• Issued: 04/01/2008
• Est. Priority Date: 06/26/2002
• Status: Active Grant

• Current Assignee: Palo Alto Networks Incorporated
• Original Assignee: Verizon Services Corporation (Verizon Communications Inc.)
• Inventors: Morris, David George, Cericola, Ellen R., Davis, Nick T., Frison, Bradley J., Hetz, Harry A., Jarosinski, Kathleen F.
• Primary Examiner(s): TIEU, BINH KIEN
• Application Number:
  US10/180,398
• Time in Patent Office: 2,106 Days
• Field of Search: 379/112.01, 379/112.05, 379/112.08, 379/221.01, 379/221.08, 379/219, 379/230, 370/349, 370/352, 370/389, 370/392, 370/401, 370461-462, 370/468, 370/354, 370/402
• US Class Current: 379/112.05
• CPC Class Codes: H04J 3/1605 Fixed allocated frame structures
• CPC Class Codes: H04M 15/00 Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP

Abstract

An (e.g., primary rate interface) offload device used relieve switches designed and engineered to carry short duration voice telephone calls, from servicing other types of calls (such as modem-based Internet calls), such as calls to a remote access server. Security is enhanced by isolating signaling and data communications. Such isolation may be provided by the use of separate networks, or a network with appropriate firewalls.

Claims

1. An apparatus for offloading calls to high usage customers, the apparatus comprising:

a) a converter, the converter including

i) a first interface for terminating an inter-machine trunk,

ii) a primary rate interface, and

iii) means for converting data signals received on the first interface to new data signals for placement on the primary rate interface; and

b) a signaling interface for establishing a call, through the converter, from a first terminal device to a second terminal device,

wherein the signaling interface communicates via a signaling network that is isolated and secured from a network for carrying the new data signals using a firewall, and

wherein messages in the communications network are authenticated with the signaling network by a security gatekeeper function.

2. The apparatus of claim 1 wherein the first interface terminates an inter-machine trunk carrying time-division multiplexed signals.

3. The apparatus of claim 2 wherein at least one of the time-division multiplexed signals is a digitized voice-band signal.

4. The apparatus of claim 1 wherein the new data signals are provided on a line including 24 64-Kbps channels.

5. The apparatus of claim 4 wherein the 24 64-Kbps channels include 23 data channels and one control channel.

6. The apparatus of claim 1 further comprising:

c) a remote access server coupled with the primary rate interface, the remote access server adapted to terminate data calls.

7. The apparatus of claim 1 further comprising:

a remote access server coupled with the primary rate interface, the remote access server adapted to terminate modem calls.

8. The apparatus of claim 7 wherein tandem switches are avoided by terminating modem calls by the remote access server.

9. The apparatus of claim 1 further comprising:

c) a remote access server coupled with the primary rate interface, the remote access server adapted to convert the new data signals to an Internet protocol.

10. The apparatus of claim 9 wherein the remote access server is adapted to be coupled to an Internet protocol network, wherein the Internet protocol network is isolated from the signaling network.

11. The apparatus of claim 10 further comprising:

firewalls adapted to isolate the Internet protocol network from the signaling network.

12. The apparatus of claim 1 wherein the converter and signaling interface are accommodated on a line card.

13. The method of claim 1 wherein message sequencing in the communications network is insured by one of time-stamping and non-random sequencing to ensure that the message is not a replayed copy of a previous message.

14. A method for servicing a call to a remote access server, the method comprising:

a) setting up the call, using a signaling network, such that the call passes through a primary rate interface;

b) converting, using the primary rate interface, the call from a time-division multiplexed signal on an inter-machine trunk to a primary rate signal, wherein

the inter-machine trunk is a part of a communications network; and

c) isolating and securing the communications network from the signaling network using a firewall, wherein messages in the communications network are authenticated with the signaling network by a security gatekeeper function.

15. The method of claim 14 further comprising:

inserting the primary rate signal as data into Internet protocol packets.

16. The method of claim 15 further comprising:

providing the Internet protocol packets to an Internet protocol network,

wherein the Internet protocol network is isolated from the signaling network.

17. The method of claim 14 wherein the call communicates data originating from a modem.

18. The method of claim 14 wherein the call communicates data that is originally expressed as a voice-band signal.

19. The method of claim 14 wherein the call communicates data that is originally expressed as a dual-tone, multiple-frequency signal.

20. The method of claim 14 wherein the act of setting up the call, using a signaling network, such that the call passes through a primary rate interface, permits the call to bypass an egress central office switch.

21. The method of claim 14 wherein the primary rate signal includes 24 64-Kbps channels, and

wherein one of the 23 64-Kbps channels carries the call.

22. An apparatus for offloading calls to high usage customers, the apparatus comprising:

a) a converter, the converter including

i) a first interface for terminating an inter-machine trunk,

ii) a primary rate interface, and

iii) means for converting data signals received on the first interface to new data signals for placement on the primary rate interface; and

b) a signaling interface for establishing a call, through the converter, from a first terminal device to a second terminal device,

wherein the signaling interface communicates via a signaling network that is isolated from a network for carrying the new data signals using a firewall, and

wherein messages in the communications network are authenticated with the signaling network by a security gatekeeper function,

wherein the converter and signaling interface are accommodated on a line card.