Controllable telecommunications switch reporting compatible with voice grade lines

• US 7,388,947 B2
• Filed: 03/14/2003
• Issued: 06/17/2008
• Est. Priority Date: 03/14/2003
• Status: Active Grant

• Current Assignee: Government of the United States of America, Government of The United States of America, as Represented by the Federal Bureau of Investigation, Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Federal Bureau of Investigation The United States of America As Represented By The Office of The General Counsel, Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Smith, David B., Oh, Simon S., Loos, Thomas J., Yarbrough, David L., Kampmeier, Eric Edward, Smith, Matthew Richard
• Primary Examiner(s): TRAN, QUOC DUC
• Application Number:
  US10/387,554
• Publication Number:
  US 20040179513A1
• Time in Patent Office: 1,922 Days
• Field of Search: 379/32.01, 379/32.02, 379/32.03, 379/32.04, 379/32.05, 379/35, 379/112.01, 379/133, 379/134, 379/139, 379/221.11
• US Class Current: 379/35
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 63/30 for supporting lawful interception, monitoring or retaining of communications or communication related information circuit switched telephony call monitoring H04M3/2281

Abstract

Data generated at a telecommunications network switching node is selectively delivered to one or more data receiving device (e.g., data “collection box”) connected to the network, and command and control signaling is transmitted from the data receiving device to the switching node. This bi-directional communication is carried out in a manner compatible with voice grade lines. In an exemplary application, call identifying information, referred to in the TIA/EIA Standard as CDC (Call Data Channel) Messages, is delivered from an Intercept Access Point (IAP) switch that provides telephone service to a subject of an authorized surveillance order, to a law enforcement data collection box, utilizing Frequency Shift Keying (FSK) signals. Control signals are sent from the data collection box to the IAP switch utilizing Dual Tone Multi-Frequency (DTMF) signaling. The state of the art is advanced, and a contribution is made to law enforcement and other fields, as the invention allows replacement of costly and lengthily provisioned data delivery circuits, such as ISDN lines or private digital data circuits, with widely available and less expensive voice-band data delivery equipment.

Claims

1. A voice grade line compatible method for selectively transmitting data generated by a switching node of a telecommunications network to a data receiving device connected to the network, the method comprising:

generating data at said switching node;

transmitting to said data receiving device, over an analog network link, analog signals forming reporting messages corresponding to said data, each message comprising a plurality of data packets arranged according to a predetermined data packet framework;

receiving at said switching node control signals originating as analog signals sent from said data receiving device, said control signals pertaining to operation of said switching node; and

operating said switching node in accordance with the control signals received from the data receiving device;

wherein a said control signal received from said data receiving device includes a request to said switching node to retransmit a said reporting message to data receiving device, and said switching node retransmits a said reporting in response to said request.

2. A method according to claim 1, wherein said reporting messages include a call identifying message pertaining to a call placed through said switching node to or from a user terminal serviced by the switching node.

3. A method according to claim 2, wherein the analog signals forming said call identifying reporting messages comprise Frequency Shift Keying (FSK) signals.

4. A method according to claim 2, wherein said switching node transmits said call identifying message to said data receiving device in response to said call being placed through the switching node.

5. A method in accordance with claim 2, wherein said call identifying message data is stored in a buffer memory and said control signals include a signal requesting the switching node to start spooling said call identifying message data from said buffer memory.

6. A method in accordance with claim 5, wherein the control signals comprise Dual-Tone Multi-Frequency (DTMF) signals.

7. A method in accordance with claim 5, the method further comprising the step of transmitting a buffer memory status message to the data receiving device.

8. A method in accordance with claim 2, wherein a said control signal received from said data receiving device includes a request that the switching node establish a call content communication path, and said switching node establishes a call content communication path in response to the request.

9. A method in accordance with claim 8 wherein a said switching node mutes the call content communication path in response to a mute request signal received from said data receiving device.

10. A method according to claim 1, wherein a said control signal received at said switching node initiates said transmitting of a said reporting message to the receiving device.

11. A method according to claim 1, wherein a said control signal received at said switching node causes said switching node to transmit a said reporting message to a second data receiving device connected to said network.

12. A method in accordance with claim 1, wherein the control signals comprise Dual-Tone Multi-Frequency (DTMF) signals.

13. A method in accordance with claim 1, wherein the analog signals forming said reporting messages comprise Frequency Shift Keying (FSK) signals.

14. A method in accordance with claim 13, wherein said predetermined data packet framework comprises a GR-30 protocol framework.

15. A method according to claim 1, wherein a said control signal received at said switching node includes an indication of whether there was an error in said data receiving device receiving one or more data packets of a reporting message, and in the event of an error, said method further includes the step of generating, at said switching node, a further signal retransmitting at least the data packet(s) indicated by said control signal to be faulty.

16. A method in accordance with claim 15, wherein each of the plurality of data packets forming a reporting message includes an indication of whether the data packet is the last data packet of the respective reporting message.

17. A method in accordance with claim 15, wherein each of the plurality of data packets forming a reporting message includes an indication of whether the data packet is the first data packet of the respective reporting message.

18. A method in accordance with claim 15, wherein each of the plurality of data packets forming a message are individually identifiable by labels associated therewith.

19. A method in accordance with claim 1, wherein prior to sending the reporting message, the switching node dials out to the data receiving device.

20. A method in accordance with claim 19, wherein prior to dialing out to the data receiving device, the switching node determines that a buffer memory has been filled with reporting message data to a predetermined level.

21. A method in accordance with claim 19, wherein prior to dialing out to the data receiving device, the switching node receives a request to dial out to the data receiving device.

22. A method in accordance with claim 19, wherein prior to dialing out to the data receiving device, the switching node determines that a timer has expired.

23. A method in accordance with claim 19, wherein the step of dialing out to the data receiving device comprises dialing out to a Directory Number included in a list of Directory Numbers stored at the switching node.

24. A method in accordance with claim 19, wherein the switching node dials out to the data receiving device using an alternative Directory Number, in response to detection of a reporting message buffer overload condition at the switching node.

25. A method in accordance with claim 1, further comprising transmitting to said data receiving device, over said analog network link, a signal requesting the data receiving device to execute a specified application functionality.

26. A voice grade line compatible method for selectively receiving data generated by a switching node of a telecommunications network, the method comprising:

receiving, at a data receiving device connected to said network, analog signals comprising a plurality of data packets arranged according to a predetermined data packet framework and transmitted over an analog network link;

assembling said data packets to form reporting messages corresponding to data generated at said switching node;

transmitting control signals originating from said data receiving device as analog control signals destined for said switching node, to thereby control an operational aspect of said switching node; and

performing error checking on data packets of reporting messages received at the data receiving device, wherein, upon detection of an error in a data packet of a reporting message received from the switching node, said analog control signals include a retransmit request signal requesting said switching node to retransmit at least a portion of a said reporting message.

27. A method according to claim 26, further comprising storing reporting messages received at said data receiving device.

28. A method in accordance with claim 26, wherein the control signals transmitted by said data receiving device include signals for logging into the switch, and a request to the switching node to start spooling reporting message data stored in a buffer memory.

29. A method in accordance with claim 28, further comprising the step of receiving, at said data receiving device, a buffer memory status message transmitted by said switching node.

30. A method according to claim 26, wherein said reporting messages comprise call identifying messages pertaining to a call placed through the switching node to or from a user terminal serviced by said switching node.

31. A method in accordance with claim 26, wherein the control signals transmitted by the data receiving device comprise Dual-Tone MultiFrequency (DTMF) signals.

32. A method in accordance with claim 26, wherein the analog signals received by the data receiving device comprise Frequency Shift Keying (FSK) signals.

33. A method in accordance with claim 26, wherein said retransmit request signal is sent immediately after each detection of a data packet error.

34. A method in accordance with claim 26, wherein said retransmit request signal is not sent until after all data packets of a respective reporting message are received by the receiving device.

35. A method in accordance with claim 26, wherein said control signals include an instruction to store an alternative Directory Number to be used by said switching node in transmitting said reporting messages.

36. A method in accordance with claim 26, wherein said control signals include signals for causing said switching node to select a Directory Number from a list of stored Directory Numbers for use in transmitting said reporting messages.

37. A method in accordance with claim 26, further comprising receiving, at said data receiving device, a control signal sent by said switching node over said network link and, in response to said control signal, executing a specified application functionality.

38. A method in accordance with claim 26, wherein said control signals comprise a signal requesting that said switching node establish a call content communication path.

39. A method in accordance with claim 38, wherein said control signals further comprise a mute signal for requesting that the switching node mute the call content communication path established by said switching node.

40. A method in accordance with claim 39, wherein said mute signal controls the switching node to mute said call content communication path for a predetermined period of time, and to subsequently un-mute said path.

41. A method in accordance with claim 39, wherein said mute signal controls the switching node to mute the call content communications path until said switching node is instructed by said receiving device to un-mute the path.

42. A method in accordance with claim 39, wherein said mute signal controls the switching node to mute the call communication path until the occurrence of a specified call event, whereupon said path is un-muted.

43. A voice grade line compatible data receiving device for selectively receiving data generated by a switching node of a telecommunications network, the device comprising:

a receiver for receiving analog signals transmitted over an analog network link, said signals comprising a plurality of data packets arranged according to a predetermined data packet framework;

means for assembling said data packets to form reporting messages corresponding to data generated at said switching node;

a transmitter for transmitting control signals originating from said data receiving device as analog signals n destined for said switching node, to thereby control an operational aspect of said switching node; and

means for performing error checking on reporting messages received by data receiving device, and wherein, upon detection of an error in a said reporting message, said transmitter transmits a retransmit request signal requesting said switching node to retransmit at least a portion of said reporting message.

44. A data receiving device according to claim 43, further comprising a data storage device for storing reporting message data received by data receiving device.

45. A data receiving device in accordance with claim 43, wherein the analog control signals transmitted by said transmitter include signals for logging into the switching node, and a request to the switching node to start spooling reporting message data stored in a buffer memory thereof.

46. A data receiving device according to claim 43, wherein said reporting messages comprise call identifying messages pertaining to a call placed through the switching node to or from a user terminal serviced by said switching node.

47. A data receiving device in accordance with claim 43, wherein the control signals transmitted by the transmitter comprise Dual-Tone MultiFrequency (DTMF) signals.

48. A data receiving device in accordance with claim 43, wherein the analog signals received by the receiver comprise Frequency Shift Keying (FSK) signals.

49. A data receiving device in accordance with claim 43, wherein said retransmit request signal is transmitted by said data receiving device immediately after each detection of a data packet error.

50. A data receiving device in accordance with claim 43, wherein said retransmit request signal is not transmitted until after all data packets of a respective reporting message are received by the data receiving device.

51. A data receiving device in accordance with claim 43, wherein said control signals include an instruction to substitute an alternative Directory Number to be used by said switching node in transmitting said reporting messages.

52. A data receiving device in accordance with claim 43, wherein said control signals include signals for causing said switching node to select a Directory Number from a list of stored Directory Numbers for use in transmitting said reporting messages.

53. A data receiving device in accordance with claim 43, wherein said control signals comprise a signal requesting said switching node to establish a call content communication path.

54. A data receiving device in accordance with claim 53, wherein said control signals further comprise a mute request signal for requesting that the switching node mute the call content communication path established by said switching node.

55. A machine readable storage medium containing a set of instructions which, when executed within a data receiving device of a telecommunications network, causes said data receiving device to carry out a voice grade line compatible method for selectively receiving data generated by a switching node of the telecommunications network, the method comprising:

receiving, at the data receiving device, analog signals comprising a plurality of data packets arranged according to a predetermined data packet framework and transmitted over an analog network link;

assembling said data packets to form reporting messages corresponding to data generated at said switching node; and

transmitting control signals originating from said data receiving device as analog control signals destined for said switching node, to thereby control an operational aspect of said switching node.

wherein, in the method carried out upon execution of said instructions, upon detection of an error in a reporting message received from the switching node, said analog control signals include a retransmit request signal requesting said switching node to retransmit at least a portion of a said reporting message.

56. A machine readable storage medium according to claim 55, wherein the method carried out upon execution of said instructions further comprises recording reporting messages received at said data receiving device.

57. A machine readable storage medium in accordance with claim 55, wherein, in the method carried out upon execution of said instructions, the control signals transmitted by said data receiving device include signals for logging into the switch, and a request to the switching node to staff spooling reporting message data stored in a buffer memory.

58. A machine readable storage medium according to claim 55, wherein, in the method carried out upon execution of said instructions, said reporting messages comprise call identifying messages pertaining to a call placed through the switching node to or from a user terminal serviced by said switching node.

59. A machine readable storage medium in accordance with claim 55, wherein, in the method carried out upon execution of said instructions, the control signals transmitted by the data receiving device comprise Dual-Tone MultiFrequency (DTMF) signals.

60. A machine readable storage medium in accordance with claim 55, wherein, in the method carried out upon execution of said instructions, the analog signals received by the data receiving device comprise Frequency Shift Keying (FSK) signals.

61. A machine readable storage medium in accordance with claim 55, wherein, in the method carried out upon execution of said instructions, said retransmit request signal is sent immediately after each detection of a data packet error.

62. A machine readable storage medium in accordance with claim 55, wherein, in the method carried out upon execution of said instructions, said retransmit request signal is not sent until after all data packets of a respective reporting message are received by the receiving device.

63. A machine readable storage medium in accordance with claim 55, wherein, in the method carried out upon execution of said instructions, said control signals include an instruction to substitute an alternative Directory Number to be used by said switching node in transmitting said reporting messages.

64. A machine readable storage medium in accordance with claim 55, wherein, in the method carried out upon execution of said instructions, said control signals include signals for causing said switching node to select a Directory Number from a list of stored Directory Numbers for use in transmitting said reporting messages.

65. A machine readable storage medium in accordance with claim 55, wherein, in the method carried out upon execution of said instructions, said control signals comprise a signal requesting that said switching node establish a call content communication path.

66. A machine readable storage medium in accordance with claim 65, wherein, in the method carried out upon execution of said instructions, said control signals further comprise a mute request signal for requesting that the switching node mute the call content communication path established by said switching node.

67. A voice grade line compatible method for selectively transmitting data generated by a switching node of a telecommunications network to a data receiving device connected to the network, the method comprising:

generating data at said switching node;

transmitting to said data receiving device, over an analog network link, analog signals forming reporting messages corresponding to said data, each message comprising a plurality of data packets arranged according to a predetermined data packet framework;

receiving at said switching node control signals originating as analog signals sent from said data receiving device, said control signals pertaining to operation of said switching node; and

operating said switching node in accordance with the control signals received from the data receiving device;

wherein prior to sending the reporting message, the switching node dials out to the data receiving device and prior to dialing out to the data receiving device, the switching node determines that a timer has expired.

68. A voice grade line compatible method for selectively receiving data generated by a switching node of a telecommunications network, the method comprising:

receiving, at a data receiving device connected to said network, analog signals comprising a plurality of data packets arranged according to a predetermined data packet framework and transmitted over an analog network link;

assembling said data packets to form reporting messages corresponding to data generated at said switching node; and

transmitting control signals originating from said data receiving device as analog control signals destined for said switching node, to thereby control an operational aspect of said switching node;

wherein, said control signals comprise a signal requesting that said switching node establish a call content communication path and wherein said control signals further comprise a mute signal for requesting that the switching node mute the call content communication path established by said switching node.