Failsafe configuration for alternative network telephony

• US 6,980,638 B1
• Filed: 03/13/2003
• Issued: 12/27/2005
• Est. Priority Date: 03/13/2003
• Status: Expired due to Term

• Current Assignee: ARRIS Enterprises LLC (CommScope Holding Company, Inc.), Vulcan Ventures Inc. (Vulcan, Inc.)
• Original Assignee: Digeo Incorporated (CommScope Holding Company, Inc.), Vulcan Research LLC
• Inventors: Lee, Michael, Young, Steve, Krein, Todd, Smith, Geoff
• Primary Examiner(s): Bui, Bing Q.
• Application Number:
  US10/389,277
• Time in Patent Office: 1,020 Days
• Field of Search: 379/45, 379/46, 379/114.02, 379/220.01, 379/221.01, 379/221.02, 379/221.03, 379/271, 379/272, 379/273
• US Class Current: 379/221.01
• CPC Class Codes: H04M 7/0057 Services where the data services network provides a telephone service in addition or as an alternative, e.g. for backup purposes, to the telephone service provided by the telephone services network

Abstract

A failsafe configuration for alternative network telephony is disclosed. An indication as to whether an alternative network telephony call processing system is available to process calls from an associated piece of telephone equipment is received automatically and transparently to a user of the telephone equipment. Calls placed from the telephone equipment at a time when the alternative network telephony call processing system is available to process calls are processed via alternative network telephony. Calls placed from the telephone equipment at a time when the alternative network telephony call processing system is not available to process calls are processed via the public switched telephone network (PSTN).

Claims

1. A method for providing alternative network telephony, comprising:

receiving an indication as to whether an alternative network telephony call processing system is available to process calls from an associated piece of telephone equipment, the indication being received automatically and transparently to a user of the telephone equipment;

processing via alternative network telephony calls placed from the telephone equipment at a time when the alternative network telephony call processing system is available to process calls including by;

receiving outgoing audio data at a first local node;

shifting the outgoing audio data up in frequency at the first local node by a first frequency shift;

providing the frequency shifted outgoing audio data to local telephone wiring connected to the first local node;

receiving the frequency shifted outgoing audio data at a second local node connected to the local telephone wiring;

downshifting the frequency shifted outgoing audio data in frequency by the first frequency shift; and

using alternative network telephony to send the downshifted outgoing audio data to a destination; and

processing via the public switched telephone network (PSTN) calls placed from the telephone equipment at a time when the alternative network telephony call processing system is not available to process calls.

2. The method of claim 1, wherein an indication is received that the alternative network telephony call processing system is not available if the alternative network call processing system loses power.

3. The method of claim 1, wherein the alternative network telephony call processing system is configured to generate an availability signal indicating that the alternative network call processing system is available, and the method further comprises:

determining that the alternative network call processing system is available if the availability signal is received; and

determining that the alternative network call processing system is not available if the availability signal is not received.

4. The method of claim 1, further comprising providing a filter to prevent frequency shifted audio signals placed on the local telephone wiring from being passed to the PSTN.

5. The method of claim 1, further comprising providing a filter at the first local node to prevent non-frequency shifted audio signals from being passed to the telephone equipment at times when the alternative network call processing system is available.

6. The method of claim 1, wherein the indication as to whether the alternative network telephony call processing system is available is received at the first local node.

7. The method of claim 1, wherein the steps of processing via alternative network telephony calls placed from the telephone equipment at a time when the alternative network telephony call processing system is available and processing via the public switched telephone network (PSTN) calls placed from the telephone equipment at a time when the alternative network telephony call processing system is not available comprise:

receiving the outgoing audio data at the first local node;

routing the outgoing audio data through a frequency shifter if the alternative network telephony call processing system is available; and

bypassing the frequency shifter if the alternative network telephony call processing system is not available.

8. The method of claim 1, further comprising for a call placed at a time when the alternative network call processing system is not available:

receiving outgoing audio data at the first local node; and

providing the outgoing audio data to the local telephone wiring without applying any frequency shift;

wherein the local telephone wiring is connected to the PSTN such that the non-frequency shifted audio data is provided to the PSTN.

9. The method of claim 1, wherein the outgoing audio data is associated with an alternative network telephony call between a first party who provided the outgoing audio data and a second party at the destination, further comprising:

receiving at the second node, via alternative network telephony, incoming audio data from the destination;

frequency shifting the incoming audio data in frequency by a second frequency shift;

providing the frequency shifted incoming audio data to the local telephone wiring;

receiving the frequency shifted incoming audio data at the first node;

downshifting the frequency shifted incoming audio data by the second frequency shift; and

providing the downshifted incoming audio data to a local call participant associated with the first node.

10. The method of claim 1, wherein the telephone equipment comprises a telephone handset.

11. The method of claim 1, wherein the telephone equipment comprises a fax machine.

12. The method of claim 1, wherein the telephone equipment comprises a computer modem.

13. A method for providing alternative network telephony for calls placed from a piece of telephone equipment associated with local telephone wiring connected to the PSTN, comprising:

receiving at a first local node connected to the local telephone wiring outgoing audio data generated by the telephone equipment;

shifting the outgoing audio data up in frequency by a first frequency shift;

providing the frequency shifted outgoing audio data to the local telephone wiring;

receiving the frequency shifted outgoing audio data at a second local node connected to the local telephone wiring;

downshifting the frequency shifted outgoing audio data in frequency by the first frequency shift; and

using alternative network telephony to send the downshifted outgoing audio data to a destination.

14. A system for providing alternative network telephony for a telephone equipment associated with local telephone wiring, comprising:

an alternative network telephony call processing system having a first connection to the local telephone wiring and a second connection to an alternative network, the call processing system comprising a processor configured to complete calls via the alternative network using alternative network telephony;

a connector interposed between the telephone equipment and the local telephone wiring, the connector being configured to;

receive an indication whether the alternative network call processing system is available;

modify outgoing audio data received from the telephone equipment and provide the modified outgoing audio data to the local telephone wiring if the alternative network call processing system is available; and

provide outgoing audio data received from the telephone equipment to the local telephone wiring without modification if the alternative network call processing system is not available;

wherein the alternative network call processing system is configured to receive modified outgoing audio data via the local telephone wiring, restore the modified outgoing audio data to its original form, and send the restored outgoing audio data to a destination via alternative network telephony, and wherein outgoing audio data that has not been modified is passed to the public switched telephone network (PSTN) whereby calls may be completed normally via the PSTN at times when the alternative network telephony call processing system is not available.

15. The system of claim 14, wherein the connector is configured to modify outgoing audio data by shifting outgoing audio data up in frequency by a first frequency shift and the alternative network call processing system is configured to restore the frequency shifted outgoing audio data to its original form by downshifting the frequency shifted outgoing audio data in frequency by the first frequency shift.

16. The system of claim 15, further comprising a filter interposed between the local telephone wiring and the PSTN to prevent frequency shifted audio signals provided to the local telephone wiring from being passed to the PSTN.

17. The system of claim 15, wherein the indication whether the alternative network call processing system is available comprises an indication as to whether power is available to the alternative network call processing system.

18. The system of claim 15, wherein the alternative network call processing system is further configured to provide the indication whether the alternative network call processing system is available.

19. The system of claim 18, wherein the indication whether the alternative network call processing system is available comprises a signal at a prescribed frequency provided to the local telephone wiring by the alternative network call processing system.

20. The system of claim 15, wherein the alternative network call processing system is further configured to receive incoming audio data from the destination via the alternative network telephony, shift the incoming audio data up in frequency by a second frequency shift, and provide the frequency shifted incoming audio data to the local telephone wiring, and wherein the connector is further configured to receive frequency shifted incoming audio data via the local telephone wiring, downshift the received frequency shifted incoming audio data in frequency by the second frequency shift, and provide the downshifted incoming audio data to the telephone equipment.

21. The system of claim 20, wherein the first frequency shift and the second frequency shift are the same.

22. The system of claim 15, wherein the connector comprises a frequency shifter configured to apply the first frequency shift and a switch configured to route outgoing audio data to the frequency shifter if the alternative network call processing system is available.

23. The system of claim 22, wherein the switch is configured to route outgoing audio data to the local telephone wiring without first sending it through the frequency shifter if the alternative network call processing system is not available.

24. The system of claim 15, wherein the alternative network call processing system is configured to ignore audio signals received via the local telephone wiring that have not been frequency shifted.

25. The system of claim 15, wherein the alternative network call processing system comprises a television set top box.

26. A connector for use in providing alternative network telephony for a telephone equipment associated with local telephone wiring using an alternative network telephony call processing system having a first connection to the local telephone wiring and a second connection to an alternative network, the connector comprising:

a first connection to the telephone equipment, the connector being configured to receive outgoing audio data via the first connection;

a frequency shifter configured to shift outgoing audio data received via the first connection up in frequency by a first frequency shift if the alternative network call processing system is available; and

a second connection to the local telephone wiring, the connector being configured to provide frequency shifted outgoing data to the local telephone wiring via the second connection;

wherein the alternative network call processing system is configured to receive and process frequency shifted outgoing audio data using alternative network telephony.

27. The connector of claim 26, further comprising a switch configured to route outgoing audio data received at the first connection through the frequency shifter if the alternative network call processing system is available and to instead bypass the frequency shifter and provide the non-frequency shifted outgoing audio data to the local telephone wiring via the second connection if the alternative network call processing system is not available, whereby calls may be completed using alternative network call processing at times when the alternative network call processing system is available and calls may instead be completed in the traditional manner via the public switched telephone network (PSTN) at times when the alternative network call processing system is not available.

28. The connector of claim 26, wherein the alternative network call processing system is configured to provide an availability indication indicating that the alternative network call processing system is available and wherein the connector is configured to receive the availability indication and to shift outgoing audio data received via the first connection up in frequency by a first frequency shift if the availability indication indicates that the alternative network call processing system is available.

29. An alternative network call processing system for processing via alternative network telephony calls associated with a telephone equipment associated with local telephone wiring, comprising:

a first connection to the local telephone wiring;

a second connection to an alternative network over which the call processing system is configured to process calls using alternative network telephony;

a frequency shifter configured to receive via the first connection outgoing audio data that has been shifted up in frequency by a first frequency shift and downshift the received frequency shifted outgoing audio data by the first frequency shift; and

a call processor configured to receive the downshifted outgoing audio data and send it to a destination using alternative network telephony.

30. The alternative network call processing system of claim 29, wherein the call processor is further configured to receive from the destination incoming audio data and the alternative network telephony call processing system is further configured to shift the incoming audio data up in frequency by a second frequency shift and provide the frequency shifted incoming audio data to the local telephone wiring.

31. The alternative network call processing system of claim 30, wherein the first frequency shift and the second frequency shift are the same.

32. The alternative network call processing system of claim 29, wherein the call processing system is configured to provide to the local telephone wiring an indication that the call processing system is available to process calls using alternative network telephony.