Local Exchange Carriers
Long Distance Telephone
- AT&T ®
- Motorola
- Nortel Networks
- Deutsche Telekom
- Sprint
- Alcatel
- British Telecommunications (BT)
- Verizon Communications
- MCI
- 360networks
- 3M Telecommunications
- 8884Dialtone.com
- Access Point, Inc.
- ACS Telecommunications Brokers
- ACSI Network Technologies
- Adelphia Business Solutions
- Ahmad Nassir AlBinali & Sons Company
- Alcatel
- AllCom
- Allied Riser Communications
- ALLTEL
- Alpha Business Communications
- Alpha Telecom Ltd
- AlphaNet Telecom Inc
- Always On Networks, Inc.
- AMI Telecommunications
- Andrews Telecommunications Corporation
- Apex Telecommunications Training Solutions
- Argus Business Solutions
- Astra Services
- AT&T ®
- AT&T Small Business Center
- Atlantic Communications
- ATSI Communications
- Bactel
- Bechtel Telecommunications
- Belfast Telecommunications
- BellSouth
- BellSouth International
- BellSouth Small Business Solutions
- Bezeq
- Birch Telecom
- BrantTel Networks
- Brasil Telecom
- British Telecommunications (BT)
- Brix Communications
- Broadline Communications
- Broadwing
- BTI
- C3i
- Cable and Wireless
- Cabletec
- Callahan Associates International
- CANTV
- Certified Communications Inc.
- ChamberComm
- Chequamegon Telephone
- China Telecom
- Christoph Emmerich GmbH
- CimTel Net
- Cincinnati Voice & Data Communications
- Cintech Solutions
- CityNet Telecommunications
- CLS Group
- CMC Communications
- CodeTel Dominican Republic
- COMMIT-kjeden
- Commonwealth Telephone Enterprises
- Commsworld
- Communications Resource Corporation
- Connecticut Communications
- Cooperative Communications
- Corvex, Inc.
- Crane Telecommunications
- Crystal Communications, Inc.
- Cypress Communications
- Davis Communications
- Davis Company
- Deutsche Telekom
- Digital Exchange Solutions
- Digital Voice Systems (DVS)
- DirectNet Telecommunications
- Dorado Development Group
- EADS TELECOM North America
- East Florida Communications
- Easy-On-The-Pocket-Rates.com
- Eatel
- EconoPhone
- EDP Environments Inc.
- Eircom
- Elbo Telecom Technology
- Electronic Design Company
- eLink Communications
- eMeritus Communications
- Enkay Telecom India
- Enkido
- Entryphone Company Limited
- eSpoke.com
- Etisalat
- European Competitive Telecommunications Association (ECTA)
- FCNP Services, Inc.
- Fibercorp
- Final Mile Communications
- Fine Telecom, Inc.
- FLAG Telecom
- FNet Corporation
- Fortran Telephone Communication Systems
- France Telecom
- Fujitsu Network Communications (FNC)
- Fujitsu Telecommunications Europe Limited
- Galaxy Communications, Inc.
- General Dynamics Worldwide Telecommunications Systems
- Gillette Global Network
- GlobeLynx
- GO Telecom Incorporated
- Greenwoods Communications
- Group IV Products
- Hector Communications Corp.
- Hop-on.com, Inc.
- Huntleigh Telecom, Inc.
- ILD Telecommunications
- Infinity Communications
- Infotel
- Intelcom San Marino Telecommunication
- Invsat Limited
- Ionex Telecommunications
- ioWave
- ITC Holding Company
- IVR Q-voz
- JCI Communications, Inc.
- JKC
- JMA Wired
- Kamputech.Inc.
- Kendid Communications
- Korea Telecom
- Kovacs
- KPN
- Landssími Íslands - Iceland Telecom
- Lantana
- Laslink
- LDCircuit.com
- Luminet
- Macquarie Corporate Telecommunications
- Marathon On-Line Services
- Maritime Telegraph and Telephone Co. Ltd. (MT&T)
- Matáv
- Maximum Network Solutions Ltd
- MCI
- MED-1 Submarine Cables
- Medcom Professional Services
- MiDAS Management Systems
- Motorola
- Mpower Communications
- Multi Media Communications
- National Engineering and Assessment Group, The
- National Rural Telecommunications Cooperative (NRTC)
- National Voice and Data
- NEAX 61
- NEC Corporate Networks Group
- NEC Corporation @
- NEON Communications
- Netbricks
- NetLojix Communications
- Network Plus
- New Horizons Telecom
- Next Century Systems
- Nippon Telegraph and Telephone (NTT)
- Norlight Telecommunications, Inc
- Nortel Networks
- NorthWestern Communications Solutions
- nTelos
- NTT America
- NTT Communications
- OAO Rostelecom
- Observer Group
- Opal Telecommunications
- Opera Telecom
- Optimum Telecom
- Optus
- OýConnor Telservices, Inc.
- Pacific Wave Industries
- Palestine Telecomunications Company
- PangeaTech, Inc.
- Paramount Designs
- Passport Telecom
- Peel Telephones
- penntele.com
- Peregrine Communications
- Philcom Corporation
- Philippine Long Distance Telephone Company (PLDT)
- Phonecards Onsale
- PhonePlusSolution.com
- Pioneer Telephone
- Porng Da International
- Portugal Telecom
- PowerDsine
- Prairie Systems
- Qmedia.net
- QuesCom
- RagingWire Telecommunications, Inc.
- RCN
- Reichle & De-Massari AG
- Rogers Communications
- RomLink International
- RWE Telliance
- Ryan Hankin Kent, Inc. (RHK)
- SAIT-RadioHolland
- Sarco Communications Company
- SBC Communications
- Science Dynamics
- Seren Innovations, Inc.
- Shared Technologies Fairchild
- Shenandoah Telecommunications
- SIGECOM
- Simplexity.com
- SITA
- SmartStop, Inc.
- SMI International
- Southeastern Telecom
- Southern Cross Cable Network
- Spectrum Communications
- Sprint
- Sprint North Supply
- Sprint: Products and Services
- Starcom Hellas
- SU-KAM Groups of Companies (CVR)
- Suntel
- SureCom Corporation
- SureWest Communications
- Swaziland Posts and Telecommunications Corporation
- Swisscom
- T1 Services
- TAF Telematica
- TDC
- Telco-Partners
- TelcoLink Inc.
- Telcon International, Inc.
- TelcoRock
- Tele-Presence
- Tele2
- TeleBright Corporation
- Telebrás
- Telecom Distribution Services Corp.
- Telecom Solutions
- TelecomDefinitions.com
- Telecommunications of Dominica Ltd
- Telecommunications Research Associates (TRA)
- Telecommunications Services of Trinidad and Tobago
- Telefonica CTC Chile
- Telefonos de Mexico
- Telefonverk Føroya Løgtings
- Telefónica de Espana
- TeleGea.com
- Teleglobe
- Telemar
- Telepac, Serviços de Telecomunicações, SA
- Telephone Support Systems
- Telesolutions
- Telesys Communications
- Telex-Chile
- TeliaSonera
- Telica
- Telident
- Teligent
- Telkom
- Telkom SA
- Telscape Communications, Inc
- TerraBreeze Communications & Security Systems
- TierOne Telecommunications Management Group
- TollBridge Technologies
- Torch Telecom
- Total Technologies
- Tracking Communications Inc.
- Travis Voice & Data
- Tri-Tec Communications, Inc.
- Tricom
- TTI National
- U.S. Online Communications
- UbiNetics
- UniDial Communications Inc.
- Uralsviazinform Telecommunication Company
- Urmet
- Ursa Major International Ltd
- USA Telephone
- USOL Holdings
- USTeleCenters Web
- Utmost
- Vanco
- Verity Communications
- Verizon Communications
- VersaTel Telecom
- WarpSpeed Communications
- Warwick Valley Telephone Company
- Westcape Communications
- WhoWhere?ConnectNow!
- WideOpenWest
- Widermind
- Wood County Telephone Company
- Working Assets
- World Telecommunications Links
- WorldCom
- WorldPort Communications, Inc.
- Zhone Technologies
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