| Business | Phone |
| Communication Ties 115 Ryan Industrial Ct, San Ramon 94583 | (925) 743-4400 |
| D & A Communications 632 Rock Rose Ln, San Ramon 94582 | (925) 648-5111 |
| Diablo Communications 2843 Biddleford Dr, San Ramon 94583 | (925) 828-8988 |
| Promedia Communication San Ramon 94583 | (925) 277-7678 |
| Telelase Communication Inc 2000 Crow Canyon Pl, San Ramon 94583 | (925) 973-0277 |