| Business | Phone |
| Graham Communications 9110b Alcosta Blvd # 123, San Ramon 94583 | (925) 833-0552 |
| Telpro Technologies Inc 3000 Executive Pkwy # 225, San Ramon 94583 | (925) 277-9015 |
| Enterprise Integration Group 2410 San Ramon Valley Blvd, San Ramon 94583 | (925) 362-1700 |
| Koerlin Telecommunications 231 Market Pl # 198, San Ramon 94583 | (925) 829-1641 |
| Mitel Telecommunications Systs 2680 Bishop Dr, San Ramon 94583 | (925) 275-9050 |
| Point To Point Connections Inc 2110 Omega Rd, San Ramon 94583 | (925) 855-1450 |
| Ridge Communications 12667 Alcosta Blvd, San Ramon 94583 | (925) 498-2340 |
| Sentient Group 18 Crow Canyon Ct, San Ramon 94583 | (925) 217-6600 |