Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7142857 | Apparatus, method and system for maintaining call control at a gateway mobile switching center utilizing a packet network | Robert Thomas Calabrese, Douglas Harvey Riley, Robin Jeffrey Thompson | 2006-11-28 |
| 6343215 | ANSI 41 dialed number validation | Robert Thomas Calabrese, Todd C. Morgan | 2002-01-29 |