Method and apparatus for tracing a specific communication

• US 5,930,344 A
• Filed: 10/14/1997
• Issued: 07/27/1999
• Est. Priority Date: 10/14/1997
• Status: Expired due to Term

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Shipley, Edward Nicholas, Relyea, Wayne E.
• Primary Examiner(s): Kuntz, Curtis A.
• Assistant Examiner(s): Barnie, Rexford N
• Application Number:
  US08/949,488
• Time in Patent Office: 651 Days
• Field of Search: 379/34, 379/126, 379/133, 379/114, 379/113, 379/247, 379/265, 379/266, 379/111, 379/201, 379/1, 379/27, 379/26, 379/29, 379/127, 379/115, 379/112, 379/246
• US Class Current: 379/126
• CPC Class Codes: H04M 3/2254 in networks
• CPC Class Codes: H04M 3/2281 Call monitoring, e.g. for law enforcement purposes; Call tracing; Detection or prevention of malicious calls

Abstract

A method and apparatus using information stored in a communications switch to trace a specific communication in a network, including an in-progress communication. A search request with a set of search criteria is sent to a communications switch that routes communications in the network. Information stored in the communications switch, such as a communications switch call record, is searched to locate information matching the set of search criteria in the search request. The results of the search are reported out of the communications switch allowing the specific communication to be traced.

Claims

1. A method of tracing the route of an in-progress call in a public switched telephone network having a communications switch with buffers storing information about calls in the network, comprising the steps of:

sending a set of search criteria related to the in-progress call to the communications switch;

searching information in the communications switch buffers to locate information related to the in-progress call; and

reporting the results of the search, including results that allow the route of the in-progress call to be traced, out of the communications switch while the call is still in-progress.

2. The method of claim 1 wherein the information stored in the communications switch buffers would not otherwise be output from the communications switch.

3. The method of claim 2 wherein said step of reporting is performed by the communications switch reporting call record data related to the in-progress call.

4. The method of claim 1, wherein the in-progress call is traced to an originating communications switch.

5. The method of claim 1, wherein the in-progress call is traced to a terminating communications switch.

6. The method of claim 1, wherein the search request is sent to a plurality of communications switches in the network.

7. The method of claim 6, further comprising the step of:

correlating the results of the searches reported from the plurality of switches.

8. The method of claim 1, further comprising the steps of:

sending a second set of search criteria related to the in-progress call based on the results reported from the search, to a second communications switch;

performing a second search for information in the second communications switch buffers to locate information matching the second set of search criteria; and

reporting the results of the second search from the second communications switch to allow the in-progress call to be traced.

9. The method of claim 1 wherein the set of search criteria contains an identifier number associated with an information buffer used to store events related to the in-progress call.