| Business | Phone |
| Business Office Communications 8701 La Mesa Blvd, La Mesa 91941 | (619) 698-2666 |
| Business Telecom Management 8348 Center Dr # D, La Mesa 91942 | (619) 644-5544 |
| Knorr Telecom 4800 Williamsburg Ln # 225, La Mesa 91941 | (619) 463-4029 |
| Systems Simplified 9316 Tomiko Ct, La Mesa 91941 | (619) 463-8168 |