| Business | Phone |
| Commerciant Corp 2901 Wilcrest Dr 250, Houston 77042 | (713) 414-5500 |
| Datavoice Technology 2825 Wilcrest Dr, Houston 77042 | (713) 783-0123 |
| Aasap Voice Mail 15110 Draper Rd, Houston 77014 | (972) 480-5900 |
| American Voice Mail Houston 77008 | (713) 861-3355 |
| Automated Voice & Data Sltns 3100 Timmons Ln, Houston 77027 | (713) 963-0900 |
| Berryman Telesys 1223 W Clay St, Houston 77019 | (713) 522-9240 |
| Confidential Connection 210 W Land Dr, Houston 77056 | (713) 850-7900 |
| D & D's Telecom Svc 9219 Katy Fwy, Houston 77024 | (713) 973-7702 |
| Dps Intl 14610 Oak Bluff Ct, Houston 77070 | (281) 376-6579 |
| International Voice Exchange 12436 Fm 16 W 110, Houston 77065 | (281) 440-6296 |