| Business | Phone |
| Communications Solutions 6850 Regional St # 100, Dublin 94568 | (925) 556-9970 |
| Diablo Communications Dublin 94568 | (925) 828-8503 |
| Eggers Telecommunication Voice 7516 Bonniewood Ln, Dublin 94568 | (925) 829-4343 |
| Mason Communication Svc Dublin 94568 | (925) 829-0290 |
| Product Support Solutions Inc 6761 Sierra Ct, Dublin 94568 | (925) 875-0864 |
| Spectrum Telecom Systems Intl 5601 Arnold Rd # 102, Dublin 94568 | (925) 479-7800 |
| Telecom Plus 7027 Dublin Blvd # 621, Dublin 94568 | (925) 556-6600 |
| Trw Communications Inc Dublin 94568 | (925) 875-9647 |