| 6330235 |
Method and apparatus providing data communication over an existing telephone network without interfering with normal telephony functions |
Kevin P. Grundy, John K. Seamons |
2001-12-11 |
| 5483580 |
Methods and apparatus for non-simultaneous transmittal and storage of voice message and digital text or image |
Yigal Brandman, Charlotte Koerschen, Frank Lin, Shahryar Soroosh, Jason Subramaniam +1 more |
1996-01-09 |
| 5479498 |
Digital line card having universal port for upgrading electronic messaging system |
Yigal Brandman, Frank Lin, Manoj Puri, Jason Subramaniam |
1995-12-26 |
| 5394460 |
Voice processing systems connected in a cluster |
Burton N. Kendall |
1995-02-28 |
| 5301226 |
Voice processing systems connected in a cluster |
Burton N. Kendall |
1994-04-05 |
| 5136648 |
Message storage security system |
Holley Taylor, Thomas Mandey |
1992-08-04 |
| 4521647 |
Tone detection system and method |
Samuel R. Hawes |
1985-06-04 |