| Business | Phone |
| A & E Velocitel Inc 4160 Hacienda Dr # B, Pleasanton 94588 | (925) 734-6631 |
| Assist Telcom 5673 W Las Positas Blvd # 207, Pleasanton 94588 | (925) 737-4600 |
| Centergy Solutions 6920 Koll Center Pkwy, Pleasanton 94566 | (925) 600-2250 |
| Comverse Information System Pleasanton 94566 | (925) 417-7313 |
| Gte Customer Networks 4511 Willow Rd # 3, Pleasanton 94588 | (925) 463-0644 |
| Matrix Technologies 4309 Hacienda Dr # 550, Pleasanton 94588 | (925) 226-4500 |
| Maverick Networks 4782 Sutter Gate Ave, Pleasanton 94566 | (925) 931-1900 |
| Networkanatomy 74 W Neal St, Pleasanton 94566 | (925) 249-8900 |
| Ryco Solutions 40 California Ave, Pleasanton 94566 | (408) 719-9600 |
| Verizon 4511 Willow Rd, Pleasanton 94588 | (925) 416-5800 |
| White Communications Pleasanton 94588 | (925) 463-2222 |