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| Patent ID | Title | Date Filed |
| 5444767 | Systems and methods for recording and delivering personalized audio messages
| March 9, 1994 |
| 5434920 | Secure telecommunications
| August 27, 1993 |
| 5412726 | Telecommunication installation with secure remote loading of prepayment means and corresponding remote loading process
| September 21, 1993 |
| 5402490 | Process for improving public key authentication
| September 1, 1992 |
| 5392357 | Secure telecommunications
| December 9, 1991 |
| 5365590 | System for providing access to digitally encoded communications in a distributed switching network
| April 19, 1993 |
| 5301246 | Data communications equipment security device using calling party directory number
| July 29, 1992 |
| 5301234 | Radiotelephone installation for prepayment operation with security protection
| October 10, 1991 |
| 5289542 | Caller identification system with encryption
| March 4, 1991 |
| 5280529 | Communication network intended for secure transmissions
| April 29, 1992 |
| 5210794 | Apparatus and method for establishing crypto conferences on a telecommunications network
| December 21, 1990 |
| 5181243 | System and method for communications security protection
| May 19, 1989 |
| 5168519 | System and method for securing DTMF transmission
| January 2, 1991 |
| 5148478 | System and method for communications security protection
| December 17, 1990 |
| 5136648 | Message storage security system
| September 5, 1990 |
| 5115466 | Communication network intended for secure transmission of speech and data
| October 31, 1990 |
| 5067153 | Method for transmitting subscriber data in communication systems from one secret subscriber equipment to another
| September 27, 1990 |
| 5062136 | Telecommunications system and method
| September 12, 1990 |
| 5058163 | Interface unit for transferring digital data between time-domain multiplexed communication links
| October 12, 1988 |
| 5058156 | Network interface and communication terminal
| September 11, 1989 |
| 5014315 | Digital telephone system
| July 18, 1989 |
| 5003593 | Teleconferencing method for a secure key management system
| June 5, 1989 |
| 4972479 | Method and apparatus for providing privacy/security in a communication system
| July 10, 1987 |
| 4937862 | Remote monitoring device
| October 14, 1988 |
| 4920567 | Secure telephone terminal
| July 3, 1986 |
| 4920565 | Method for connection of secure conference calls
| July 18, 1988 |
| 4897875 | Key management system for open communication environments
| September 3, 1987 |
| 4893340 | Multijunction unit apparatus for use in a digital network
| October 5, 1988 |
| 4873721 | Device for starting charging in a pay phone
| November 17, 1987 |
| 4866771 | Signaling system
| January 20, 1987 |
| 4845749 | Secure teleconferencing system
| December 21, 1987 |
| 4823389 | Method and circuit apparatus for checking the authorization of access to a signal processing system
| May 14, 1986 |
| 4815128 | Gateway system and method for interconnecting telephone calls with a digital voice protected radio network
| July 3, 1986 |
| 4802220 | Method and apparatus for multi-channel communication security
| March 20, 1985 |
| 4794644 | Method of secured communications in a telecommunications system
| December 11, 1986 |
| 4763351 | Computer security system
| April 24, 1985 |
| 4531023 | Computer security system for a time shared computer accessed over telephone lines
| August 13, 1982 |
| 4484025 | System for enciphering and deciphering data
| February 3, 1981 |
| 4449247 | Local orderwire facility for fiber optic communication system
| July 30, 1980 |
| 4398062 | Apparatus for privacy transmission in system having bandwidth constraint
| February 20, 1981 |
| 4232194 | Voice encryption system
| March 16, 1979 |
| 4228321 | Privacy transmission system with remote key control
| May 16, 1978 |
| 4182933 | Secure communication system with remote key setting
| February 14, 1969 |
| 4086435 | Method of and means for scrambling and descrambling speech at audio frequencies
| September 17, 1976 |
| 4020285 | Voice security method and system
| January 29, 1975 |
| 4013837 | Voice security method and system
| January 29, 1975 |
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