| S.no | Company Name | Founded | Country |
|---|---|---|---|
| 1 | Relay Service Co. | USA | |
| 2 | Cisco Systems Inc. | USA | |
| 3 | HSI Sensing | USA | |
| 4 | GC Electronics Inc. | USA | |
| 5 | Develcon | USA | |
| 6 | Encore Networks | USA | |
| 7 | NSGDatacom Inc. | USA | |
| 8 | Sangoma Technologies Corp. | USA | |
| 9 | Cytec Corp. | USA | |
| 10 | D & D Instruments | USA | |
| 11 | Adax Inc. | USA | |
| 12 | InTrada-Sync | USA | |
| 13 | Nortel Networks Corp. | USA | |
| 14 | Cascade Communications Corp. | USA |
