Issued Patents 2005
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6879680 | Method of and system for extending internet telephony over virtual private network direct access lines | Steven R. Donovan | 2005-04-12 |
| 6842447 | Internet protocol transport of PSTN-to-PSTN telephony services | — | 2005-01-11 |