| Business | Phone |
| Avaya Inc 245 S Los Robles Ave, Pasadena 91101 | (626) 304-5300 |
| Belltronix 115 W California Blvd, Pasadena 91105 | (626) 403-0515 |
| Onfiber Communication Inc 210 S De Lacey Ave, Pasadena 91105 | (626) 578-0961 |
| Cdr Data 1028 N Lake Ave # 105, Pasadena 91104 | (626) 791-9700 |
| Comcenter 1575 N Michigan Ave, Pasadena 91104 | (626) 797-7310 |
| Expansion Telecom Pasadena 91104 | (626) 296-9300 |
| Telephone Jacks Unlimited Pasadena 91106 | (626) 796-7283 |