| Business | Phone |
| A Plus Conferencing Inc Ltd 3600 S Gessner Rd 250, Houston 77063 | (713) 954-6600 |
| Conexus 5600 Nw Central Dr 102, Houston 77092 | (713) 690-5656 |
| Datacom Technology Svc 8705 Katy Fwy 304, Houston 77024 | (713) 464-5724 |
| Intercall 2700 Post Oak Blvd, Houston 77056 | (713) 402-3100 |
| A+ Conferencing 3600 S. Gessner, Suite 250, Houston 77063 | (888) 239-3969 |
| A+ Conferencing 3600 S. Gessner, Suite 250, Houston 77063 | (888) 239-3969 |