Apparatus and method for a caller ID modem interface

• US 5,546,448 A
• Filed: 11/10/1994
• Issued: 08/13/1996
• Est. Priority Date: 11/10/1994
• Status: Expired due to Term

• Current Assignee: Multi-Tech Systems Incorporated
• Original Assignee: Multi-Tech Systems Incorporated
• Inventors: Sun, Ting, Davis, Jeffrey P., Caswell, Ty J., Reinarts, Timothy J., Johnson, Gregory R.
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): LOOMIS, PAUL A
• Application Number:
  US08/337,292
• Time in Patent Office: 642 Days
• Field of Search: 379/142, 379/127, 379/130, 379/93, 379/95, 379/94, 379/96, 379/97, 379/98, 379/100
• US Class Current: 379/142.05
• CPC Class Codes: H04M 1/663 Preventing unauthorised calls to a telephone set
• CPC Class Codes: H04M 11/06 Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

Abstract

An interface for modems is described which provides rapid identification of a caller and limited access based on a variety of parameters obtained from caller identification information encoded by the telephone company. The incoming telephone call information is compared to a preprogrammed access matrix to determine if the caller is authorized to access the modem connected to the interface. A telephone call screening method and apparatus which incorporates the encoded caller identification is also described. Finally, a method and apparatus for a telephone database for statistical accounting is described.

Claims

1. A modem access control device, comprising:

first port means, connected to a communications line, for transceiving information between the access control device and the communications line;

processing means for processing access information;

data storage means, connected to the processing means, for access information storage;

caller identification decoding means, connected to the first port means and the processing means, for decoding caller identification information;

second port means, connected to a communications device and to the first port means, for transceiving information between the access control device and the communications device; and

quick hang up means, connected to the first port means and the processing means, for disconnecting an unwanted caller before communicating with the communications device upon command from the processing means.

2. A modem access control device of claim 1 wherein the modem access control device is preprogrammed with access information for identifying an unwanted caller.

3. The modem access control device of claim 1 wherein the data storage means includes means for storing caller telephone number, caller name, time of day, date, and number of calls.

4. The modem access control device of claim 2 wherein the access information comprises caller identification information including caller telephone number, caller name, time of day, and date.

5. A method for controlling access to a modem, comprising the steps of:

preprogramming a memory device with access parameters;

detecting a telephone call;

receiving caller identification information;

decoding the caller identification information;

comparing the caller identification information with the access parameters to determine whether access is authorized;

if the access is unauthorized, answering and hanging up the telephone line prior to access of the modem; and

if the access is authorized, enabling a connection to the modem.

6. The method of claim 5, wherein the step of preprogramming further comprises the step of programming a list of names of authorized caller names.

7. The method of claim 5, wherein the step of preprogramming further comprises the step of programming a list of authorized caller telephone numbers.

8. The method of claim 5, wherein the step of preprogramming further comprises the step of programming a list of authorized times of day to call.

9. The method of claim 5, wherein the step of reprogramming further comprises the step of programming a list of authorized days to call.

10. The method of claim 5, wherein the step of preprogramming further comprises the step of programming a list of authorized caller names, days and times of day to call.

11. The method of claim 5, wherein the step of preprogramming further comprises the step of programming a list of authorized caller telephone numbers, days and times of day to call.

12. The method of claim 5, wherein the step of preprogramming further comprises the step of programming a list of unauthorized caller names.

13. The method of claim 5, wherein the step of preprogramming further comprises the step of programming a list of unauthorized caller numbers.

14. An interface for connecting a modem to a telephone line, comprising:

a telephone input port for receiving telephone signals into the interface;

a ring detector, connected to the telephone input port, for detecting incoming calls;

a quick hang up circuit, connected to the telephone input port, for disconnecting unauthorized callers prior to accessing the modem;

a telephone output port for transmitting telephone signals to the modem;

a caller identification decoder, connected to the output port, for decoding caller identification information;

a controller, connected to the ring detector, quick hang up circuit, and caller identification decoder, for controlling the interface and for comparing the caller identification information to an access matrix for authorization purposes;

a memory device, connected to the controller, for storing the access matrix;

a pass through circuit, connected to the controller, for interconnecting the telephone input port to the telephone output port upon controller command;

an in-use detector, connected to the telephone output port and the controller, for detecting a connection between the telephone line and the modem.

15. The apparatus of claim 14 wherein the controller comprises a processor.

16. The apparatus of claim 14 wherein the controller comprises combinational logic.

17. An internal modem interface, connected to a telephone line, for screening incoming telephone calls to modem electronics, the internal modem interface comprising:

a telephone input port for receiving telephone signals into the interface;

a ring detector, connected to the telephone input port, for detecting the incoming call;

an off-hook circuit, connected to the telephone input port, for connecting the modem interface to the telephone line;

a dc holding circuit, connected to the off-hook circuit and the input port, for maintaining a connection with the incoming telephone calls;

a decoder for decoding caller identification information and modem data;

a pass through circuit, connecting the decoder to the telephone input port and the dc holding circuit, for selecting the telephone signals from the telephone input port for caller identification information decoding and from the dc holding circuit for modem data decoding;

a controller, connected to the ring detector, off-hook circuit, dc holding circuit, pass through circuit, and decoder, for controlling the internal modem interface and for comparing the caller identification to an access matrix for authorization purposes; and

a memory device, connected to the controller, for storing the access matrix, wherein the caller identification information from a telephone call is compared to the access matrix to determine if a caller is unauthorized to access the modem electronics and, if the caller is unauthorized, disconnecting the caller prior to enabling access to the modem by momentarily toggling the off-hook circuit.