- 1TouchTone.com
 - Offers full featured PBX-style business and residential broadband phone services that let users keep their existing phone numbers. - Allen-Martin Inc.
- TAPI based telephony and data communications with ActiveX controls.
- AT&T CallVantage
- Provides voice over IP plans for unlimited calling in the U.S. and Canada using a broadband connection.
- AudioCodes
- Designs, develops, and markets enabling technologies and communication subsystems for the transmission of voice, fax, and data over packet networks.
- AVAD Technologies
- Hosted IP PBX designed to meet the needs of businesses that require advanced multi-location telecommunications solutions.
- Axvoice
- Provides VoIP broadband phone services.
- Call Union
- Internet phone services with voice mail, call forwarding, paperless billing, online account management, and other features.
- Call2 Limited
- Offers international calls using Internet access and a standard direct line telephone, as well as callback buttons for web sites.
- Calls-Calls.com
- Offers USB and ethernet phones for making low cost calls across the Internet.
- Callserve
- Offers VOIP Internet phone software that allows calls from PCs to telephones.
- CallThePlanet.com
- Features a product that routes long distance calls over the Internet without a computer.
 Comease.com
- Offering long distance calling, voice mail, co-browsing and more.- deltathree
- Provider of hosted, private-label SIP-based VoIP products and services.
- dialpad.com
- PC-to-phone IP telephony service.
- Ekofon
- Voice over IP from Mexico and the United States to the rest of the world.
- Ephonevn
- Offering PC to phone services.
- eTermination.com
- Wholesale VoIP call termination inbound and outbound calling international marketplace for prepaid and post paid inbound and outbound voice traffic.
- Fastmetrics
- Offers converged services, hosted VoIP and MS Exchange-like email solutions from one integrated T1, Fibre and DSL provider.
- Free Call Planet
- Offers a VOIP gateway to make free international phone calls from any phone in the U.S. to countries around the world, including China, Hong Kong, the U.K., and Canada.
- Free World Dialup
- Community telephone service for anyone with a broadband Internet connection that allows members to make international calls through local phone lines.
- FreedomIQ
- Specialists in VoIP solutions including hosted VoIP PBX phone system, customised to meet the needs of small and medium-sized businesses across the U.S.
- GateShare
- Offering Internet phone service that includes unlimited calling to the U.S. and Canada.
- GeoPhones.com
- Directory of Internet telephony, wireless technology, and mobile and cellular services.
- GizmoCall.com
- Use your browser to call any phone anywhere in the world.
- Go2Call
- Offering PC-to-phone calls and international calling plans.
- iBasis
- Provider of wholesale Internet telephony services to telecommunications carriers and resellers.
- iConnectHere Communications
- Infinicom Unlimited Pinoy Calls
- VoIP provider offering discount phone-to-phone calls to the Philippines.
- InPhonex
- Allows users to use their Internet connection to make and receive phone calls using a VoIP network.
- ITP
- Offers residential and business voice over IP service.
- Jetnumbers Communications
- Offers virtual phone numbers and international call forwarding to help users get closer to customers, business partners, or family.
- LATIC Communications
- Internet-based, phone-to-phone communications service.
- MiBridge
- Specialises in compression systems like fax over IP and voice over IP.
- Millabs
- Offering broadband phone services including local and long distance, voice-mail, caller ID, and international calling package plans accessible over broadband connections.
- Mobalex
- Mobile Internet phone services using SIP phones with SMS call back features. Site contains products information, business opportunity, and contact info. Also in Spanish, Russian, and Chinese.
- My VoIP Provider
- VoIP provider directory and search engine from My VoIP Provider. Compares and ranks service providers according to their call rates.
- MyWebDial.com
- Offers PC to phone, SMS and web callback, and device to phone services.
- MyWorldVox.com (4)
- Network Communications International Corp
- International operator services.
- NEXCell Telecom Co., Ltd.
- Makes it possible to place domestic and international calls from a personal computer to any telephone in the world.
- PCCall.com
- Offers a PC to phone Internet phone service.
- PctoPhone.com
- Allows users to make phone calls via a DSL or cable Internet connection.
- PhoneFree.com
- Develops and markets Internet Telephony services and products, including software and accessories.
- PhoneOverNet
- Offers a variety of domestic and international telephone plans that use your high-speed Internet connection instead of a traditional phone line.
- ReVoS Internet Phone Services
- VoIP phone company ReVos offers Internet-based long distance services for home or cell phones.
- Rhinobell
- Offers international phone calls through an Internet connection.
- Simple Signal VoIP
- VoIP provider Simple Signal offers T1 access along with VoIP business phone systems, telephone hardware, and software with web-based control panels to simplify business communications.
- SimpleCall
- international VOiP and Internet telecoms company with extensive destination and termination countries.
- StanaPhone
- Telephone that uses a real U.S. phone number and enables the user to make and receive free calls to and from any phone anywhere in the U.S., Canada, and a selection of other countries.
- Super Technologies, Inc.
- Provides telephone numbers to anywhere in the world over the Internet.
- Tpad VoIP and WiFi Service
- Global telephony service provider specialising in free and low cost calls anywhere in the world, using landline or mobile phones.
- TurboCall Fast Worldwide Calling
- Enter two phone numbers you want to connect, press the call button, and TurboCall will connect you. No PIN needed to place a call and no software to download and install.
- visitalk.com
- Offers voicemail, instant voice and video messaging, and a directory of personal communications numbers.
- VoIP Communications
- Providing Internet telephony and voice over IP communications services.
- VoIP.com
- Provides a variety of VoIP Internet phone service plans and rates. Serving residential and business customers.
- Voipian
- Offers internet phone call services to destinations across the world using VoIP technology.
- VoIPServices.com
- Compares VoIP services and solutions for business applications.
- Vonage
- Offers DigitalVoice, an all-inclusive broadband VoIP home phone service.
- Vonage VoIP Forum
- Features Vonage news, reviews, and forum discussions.
- WebPhone VoIP
- Web phone service provider offering PC-to-PC and PC-to-phone calls over the Internet.
- Which VoIP Service Provider
- Compare residential and business VoIP service providers. Features VoIP reviews, forums, blogs, articles, and free VoIP plan search engine.
- Wifi2Voice Broadband Telephony
- Provider of VoIP Internet phone service for residential and small business customers. Features include 911 dialing, voicemail plus, caller ID, call forwarding, distinctive rings, repeat dialing, and more.
- World Wide Call-Back Service
- On-line service allows long distance and local calls right from your browser.
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