| 7440558 |
Telephony security system |
Craig Heilmann, Mark Collier, Doug Conyers, Keith S. Pickens, David Buntin +4 more |
2008-10-21 |
| 7231027 |
Encapsulation, compression, and encryption of PCM data |
Kirk Smith, Keith S. Pickens, Craig Heilmann |
2007-06-12 |
| 6879671 |
Virtual private switched telecommunications network |
Kirk Smith, Keith S. Pickens, Craig Heilmann |
2005-04-12 |
| 6760420 |
Telephony security system |
Craig Heilmann, Mark Collier, Doug Conyers, Keith S. Pickens, David Buntin +4 more |
2004-07-06 |
| 6735291 |
Virtual private switched telephone network |
Keith S. Pickens, Craig Heilmann |
2004-05-11 |
| 6718024 |
System and method to discriminate call content type |
Craig Heilmann, Todd Beebe, David Buntin, Robert A. Applonie, Keith S. Pickens |
2004-04-06 |
| 6700964 |
Encapsulation, compression and encryption of PCM data |
Keith S. Pickens, Craig Heilmann, Kirk Smith |
2004-03-02 |