| Business | Phone |
| Globalscope Communications Crp 7400 Blanco Rd, San Antonio 78216 | (210) 321-3700 |
| Nortel Networks 300 Convent St 2330, San Antonio 78205 | (210) 357-5500 |
| Nortel Networks 7800 W Ih 10, San Antonio 78230 | (210) 979-2000 |
| Sphinx Consultants & Assoc 1800 Ne Loop 410 411, San Antonio 78217 | (210) 804-2160 |
| Tel Resource 8918 Tesoro Dr, San Antonio 78217 | (210) 829-0492 |
| Telco Systems Inc San Antonio 78217 | (972) 271-0702 |
| Texas Communications Sales Co 1138 Basse Rd, San Antonio 78212 | (210) 736-2931 |
| Voice Power Telcom 11550 W Ih 10, San Antonio 78230 | (210) 561-6171 |
| Ben Sanford & Assoc 1150 N Loop 1604 W 108-, San Antonio 78248 | (210) 366-0405 |
| Yurick & Assoc 14214 Cavalcade St, San Antonio 78248 | (210) 492-8576 |
| Communications Consulting Inc 14211 Burlwood, San Antonio 78249 | (210) 699-9069 |
| Martek Communications Inc 4403 Dividend 101, San Antonio 78219 | (210) 333-6811 |
| Normad Corp 14309 Toepperwein Rd 201, San Antonio 78233 | (210) 499-4997 |
| Polaris San Antonio 78258 | (210) 404-1616 |