System and method for remote call forward detection using signaling

• US 7,945,037 B1
• Filed: 11/22/2006
• Issued: 05/17/2011
• Est. Priority Date: 11/22/2006
• Status: Active Grant

• Current Assignee: Securus Technologies Incorporated (Securus Special Investments LLC)
• Original Assignee: Securus Technologies Incorporated (Securus Special Investments LLC)
• Inventors: Hogg, John S. Jr.
• Primary Examiner(s): Nguyen; Quynh H
• Application Number:
  US11/562,887
• Time in Patent Office: 1,637 Days
• Field of Search: 379/211.02, 379/201.01, 379/201.02
• US Class Current: 379/211.02
• CPC Class Codes: H04M 2201/18 Comparators
• CPC Class Codes: H04M 3/548 with remote control
• CPC Class Codes: H04M 7/127 where the session control protocols comprise SIP and SS7
• CPC Class Codes: H04Q 3/0025 Provisions for signalling
• CPC Class Codes: H04Q 3/0029 Provisions for intelligent networking

Abstract

Disclosed are systems and methods for using messages received from a remote switch to detect remote call forwarding. Embodiments utilize call intelligence associated with a database on an SS7 network to receive messages from a terminating switch. The return address of the message may be compared to an expected terminating switch address to confirm that the expected switch terminated the call. Embodiments may further compare a terminating phone number contained within the received message to an expected terminating phone number. Embodiments provide for various call handling in the event that a query is received from a switch other than the expected terminating switch. Such call handling may include terminating the call, recording the call, attempting to identify the called party, notifying proper authorities of the call, and/or the like. Embodiments of the invention may be deployed as part of a controlled environment facility service provider system, or in particular a detention facility service provider system.

Claims

1. A method for detecting remote call forwarding, said method comprising:

receiving a message from a remote entity, said message comprising information identifying a communication session and an address of said remote entity;

locating a record in a database using said received information identifying a communication session;

wherein said located record contains an expected address of a remote entity, an expected terminating telephone number; and

comparing information in said message to information in said located record to determine if call forwarding has been implemented with respect to said communication session.

2. The method of claim 1 wherein said comparing information in said message to information in said located record comprises:

comparing said address of said remote entity received in said message to said expected address of said remote entity contained in said located record.

3. The method of claim 1 wherein said remote entity comprises a switch, said address of said remote entity comprises a telephone number homed on said switch, and said comparing information in said message to information in said located record comprises:

comparing said telephone number homed on said switch received in said message to said expected terminating telephone number contained in said located record.

4. The method of claim 2 further comprising:

prior to receiving said message from said remote entity, creating a record in said database, said record including information identifying said communication session and an expected address of a remote entity.

5. The method of claim 2 wherein said remote entity comprises a switch, said method further comprising:

based at least in part on an expected terminating phone number, determining an expected address of said remote entity.

6. The method of claim 5 wherein said determining an expected address of said remote entity comprises querying a database.

7. The method of claim 5 wherein said determining an expected address of said remote entity comprises performing an LNP query to locate the terminating point code of the terminating switch on which said expected terminating phone number is homed.

8. The method of claim 1 wherein said message from a remote entity is a CNAM query.

9. The method of claim 1 further comprising:

transmitting the result of said comparison to originating equipment.

10. The method of claim 1 further comprising:

when said comparison does not match, transmitting a message to originating equipment.

11. The method of claim 1 further comprising:

when said comparison does not match, terminating said call.

12. The method of claim 1 wherein said message from said remote entity comprises a query requesting caller identification information, said method further comprising:

when said comparison does match, responding to said query with a first response; and

when said comparison does not match, responding to said query with a second response.

13. The method of claim 12 comprising:

based at least in part on said information identifying a communication session received in said query, locating a record in a database, wherein said first response comprises transmitting to said remote entity a name to be displayed contained in said located record and said second response comprises transmitting to said remote entity a response indicating that identification information of the caller is not available.

14. A method for detecting remote call forwarding of a call from an originating number comprising:

receiving a destination phone number;

determining identification information of the switch on which said destination phone number is homed;

receiving a query from a remote switch, wherein said query includes identification information of said remote switch;

comparing said identification of said remote switch received in said query to said determined identification information of the switch on which said destination phone number is homed for said call from said originating phone number; and

identifying remote call forwarding of the call when the identification of said remote switch and the identification of the switch on which said destination phone number is homed do not match.

15. The method of claim 14 further comprising:

transmitting the result of said comparison to a remote call processing entity.

16. The method of claim 14 further comprising:

when said comparison does not match, transmitting the result of said comparison to a remote call processing entity.

17. The method of claim 14 further comprising:

when said comparison does not match, terminating said call.

18. The method of claim 14 further comprising:

when said comparison does match, responding to said query with a first response; and

when said comparison does not match, responding to said query with a second response.

19. A system for detecting remote call forwarding comprising:

a database comprising a plurality of records, said records comprising information of an expected remote entity;

means for receiving a message from a remote entity, said message including information with respect to said remote entity;

means for locating in said database a record corresponding to said originating phone number;

means for comparing said information with respect to said remote entity received in said message to said information of an expected remote entity contained in said located record; and

means for identifying remote call forwarding when the information with respect to said remote entity and said information of an expected remote entity do not match.

20. The system of claim 19 wherein said remote entity comprises a switch, said system further comprising:

means for determining identification information of an expected switch based, at least in part, on an expected terminating phone number.

21. The system of claim 19 further comprising:

means for processing in response to said comparison.

22. The system of claim 19 further comprising:

means for transmitting to originating equipment the results of said comparison.

23. The system of claim 20 further comprising:

means for transmitting to originating equipment the results of said comparison.