Full Customer List
- 21st Century Telecom
- 360 Networks
- A & A TeleData Services
- ACC Corp.
- Access Point, Inc.
- ACN, Inc.
- Alaska DigiTel
- Alestra
- American Lightwave
- AmericaTel
- ANI Networks
- Associated Network Partners Inc. (ANPI)
- Armstrong Telephone Company (Armstrong Group)
- Atlas Communications, Ltd
- ATX Telecommunications Services, Inc.
- AXCESS Networks
- AXS Telecom
- BestComm, LLC.
- Blair Telephone
- Broad Margin
- Broadview Networks
- BTI Communications
- CABS Agent
- Callax / Dial Around
- CapRock
- Capsule Communications
- Cavalier Telephone
- Cedar Valley Communications
- Cellular 2000
- Cellular One of E/C Illinois
- Cellular One of N/E Pennsylvania
- CenturyLink
- CFL Payphones
- CGI Long Distance Services
- Charter Communications
- Chillicothe Telephone Company
- CIMCO
- Cincinnati Bell
- Cleartel Communications
- Communication Management Services
- Coastal Communications
- Com Tech International Corp
- CommRad.com
- Commonwealth Long Distance
- Community Long Distance, Inc.
- Comporium
- Consolidated Communications
- Conversent Communications, LLC (a subsidiary of One Communications Corp.)
- Copper Valley Solutions
- Covista
- Cox Communications
- CTC Communications
- Cyberlink Pacific Telecommunications
- Datalink Design
- DeltaCom
- Direct Communications
- Discovery Tel
- Dobson Telephone
- D-Two Communications
- E.Volve Technology Group, Inc.
- Eastern Tel
- Eclipse Communications
- EDCO, LLC
- ETEX Telephone Cooperative, Inc.
- Eureka
- Excel Communications
- Excell Agent Services
- Fairpoint Communications
- Filer Mutual
- First Communications, Inc.
- Florida Digital Network, Inc.
- Frankfort Plant Board
- Frontier
- General Telephone & Electronic
- Genesis Telecommunications
- Global Network Providers
- Global Network Telephone
- Go2Tel
- Golden State Cellular
- Great Lakes Comnet
- Guam Telephone
- Hargray Telephone Company
- HickoryTech
- Horry Telephone Cooperative, Inc. (HTC)
- ICT Services Corporation
- IDS Telecom
- IDT Corporation
- ILD Telecommunications
- InContact
- Inland Cellular
- Insight
- Interactive Communications
- Intermedia Communications
- ITC DeltaCom
- iWireless
- Ixia
- Kinnet
- Knology
- LC Communications
- LDD, Inc.
- LibertySurf
- Lightship Telecom
- Logix Communications
- London Telecommunications
- Long Distance International, Inc.
- M5
- Marshall Islands
- Matrix
- McLeodUSA
- Mercury
- Microtech-Tel
- Mobile Tel
- Mpower
- MTPCS
- Nations Telecom
- Navigata
- Net2000
- Network Intelligence, Inc.
- Network Long Distance
- Network Operators
- NewSouth Communications
- Nex-Tech Wireless
- NOSC
- NOVAXESS
- NOVO Networks
- NTS Communications
- Nuvox
- OLC Company
- One Communications
- Onvoy
- OTT Communications
- Pac-West Telecomm, Inc.
- PaeTec
- Personal Communications
- Phones Plus
- Pioneer Telephone Cooperative, Inc.
- PowerNet Global
- Press One
- PRIMUS Telecommunications
- PRIMUS Telecommunications Australia
- PRIMUS Telecommunications UK
- PT-1 Communications
- Qwest Communications
- Residential Communications Network
- Ringgold Telephone
- Sakon International, LLC
- South Carolina Net/Spirit Telecom
- SierraTel
- Sirius
- SNIP Link, LLC.
- Spirit Telecom
- Soft Hemisphere
- Solarus
- Source Loop
- Sovernet
- StarTec
- Star Telecommunications, Inc.
- State of Washington
- STI Prepaid / Telco Group
- Supra Telecom
- Switch Port Leasing
- Talk Talk Direct, Ltd (formerly VarTec Europe)
- Target Communications, Inc.
- TCAST Communications, Inc.
- TCC Communications, Inc.
- TCS (formerly One Call)
- TDS Telecom
- Tech Valley Communications, Inc.
- TECNET, INC.
- Tel America
- TelAlaska
- Telco Research
- TeleBarbados
- TeleBermuda
- Telecom One
- TeleHub Network Services Corp.
- Telekenex
- Telephone Associates
- Telephone Systems of Georgia
- TelNet Worldwide
- TexLink
- Thousand Islands Communications
- Thumb Cellular
- Transnational Communications International, Inc. (TNCI)
- Transaction Network Services (TNS, Inc.)
- Touch America, Inc.
- Touchtone Communications
- Trinity Valley
- Trinsic (formerly Z-Tel Communications, Inc.)
- UM Communications, Inc.
- Union Telephone
- United Wireless
- VarTec
- VarTec Europe
- VIP Communications
- Windstream / CT Communications, Inc.
- World Access Communications Corporation
- World Access Telecommunications
- Xchange Telecom, Inc.
- XO Communications
- Zephyr Telecommunications, Inc.
- Zip Com
