- 3CX
 - Developers of IP PBX and VoIP phone system software for Windows. - 8x8
- Offers the Packet8 broadband telephone service, consumer videophones, hosted iPBX solutions, and voice and video semiconductors and related software.
- @fax, Inc
- Allows businesses to fax documents through their existing fax machine over the Internet using fax over IP (FoIP) technology.
- Actiontec Internet Phone Wizard
- Product information.
 AMG Communications
- Converges PC and Internet telephony platforms through an IP-based system.- Aplio
- Telephone system that allows customers to place long-distance phone calls over the Internet.
- Aravox Technologies
- Offers a dynamic firewall that protects the systems and applications used by service providers to deliver VoIP services.
- AVAD Technologies
- Hosted IP PBX designed to meet the needs of businesses that require advanced multi-location telecommunications solutions.
- Barlam Enterprises
- Offers web design, search engine optimisation, IT solutions, e-commerce services, and IP telephony.
- cfPBX VoIP Hosted PBX
- Hosted PBX with low monthly fees, combines a multi-extension phone system.
- Clarent
- Provider of IP communication technologies.
- CommWorks
- Provider of IP-based networking services.
- DallasXtreme Ventrilo Servers
- Provides server platform for users of the popular VoiP software.
- Dimension Data
- Provides Internet telephony and voice over IP solutions, with partners Cisco.
- Doretel Communications
- Cisco Partner specialising in complete VoIP solutions. Doretel Communications provides VoIP hardware and services along with SIP proxy servers, calling card and CMS billing solutions, call relay billing platforms, and more.
- DOW Networks
- Provides international VOIP service to call centres, importers and exporters, and multinational corporations. Also provides international 800 and ITFS service.
- DSG Technology, Inc
- Manufacturer of IP and Internet telephony gateways including IPStar.
- dynamicsoft
- Provider of SIP-based software service platforms for mobile communications networks.
- Ecosmob Asterisk Services
- Ecosmob offers custom and professional Asterisk support, PBX business solutions, VOIP, FAX, and IP software solutions.
- Endstream Communications, LLC
- Endstream Communications is a next-generation carrier focusing on VoIP and telecommunications solutions.
- FacetCorp: FacetPhone
- IP-PBX designed from the ground up to be based on IP telephony. FacetPhone includes a powerful user interface, flexible voice mail, auto-attendant and IVR features, telecommuter integration, branch office support, and more.
- GlobalNet
- Delivers IP telephony services to ISPs and telecommunications service providers.
- HPC Communications
- Providing total solutions which combine elements of voice, data, web, network, and messaging.
- IconDial
- Make calls free calls from your PC to anywhere in the world by dialing the number and then watching an ad.
- Innomedia, Inc.
- Supplies computer and VoIP telephony, wireless data, videoconferencing, and other digital communication products.
- IP blue Technology Solutions
- Dedicated to VOIP software development and professional services geared towards the financial enterprise.
- IP Telecom Inc.
- Offers VOIP, IP PBX telephone, colocation, and other communication services.
- IPStarPhone.com
- Internet telephone for free long distance using dial-up, cable, or DSL.
- ISPhone
- An Internet telephone network designed for ISPs.
- ITServ Inc.
- Engaged in the design, development, and distribution of personalised Internet communication solutions and services.
- Ivron Systems
- Develops hardware and software platforms for sharing web-based and business documents over ISDN and LAN/IP networks.
- JAJAH
- Web-activated telephony service through which users can use the Internet to make low-cost calls with their phones.
- Jetnumbers Communications
- Offers virtual phone numbers and international call forwarding to help users get closer to customers, business partners, or family.
- Junction Networks
- VoIP solutions for business. Junction Networks provides SIP-compliant hosted/virtual PBX, SIP hosting, and PSTN gateway services for companies switching to VoIP.
- Ketchum Integration
- Provides voice data integration services.
- KLIP TELECOM
- Local and long distance calling service provider based in Europe offers various VoIP services worldwide.
- Komodo Technology, Inc.
- Developer of Internet telephony products utilizing VoIP technology.
- Lucky Telecom Corp.
- Offers wholesale A-Z VoIP mobile and proper termination services.
- March Networks
- Offers voice and telephony services over broadband IP and other broadband products and services for a variety of sectors.
- Mconnect VoIP Services
- Offers full-feature business VoIP services and calling packages.
- Mobile VoIP
- Reviews and news on Mobile VoIP providers.
- Mockingbird Networks
- Designs and manufactures a range of IP telephony products.
- Mountain West Telecom
- Offers phone system and telecommunication solutions for businesses.
- Net2Phone
- Offers services that allow people to make phone calls from a computer to a telephone or another PC for free or reduced rates, create and send voice e-mails, and call web sites.
- NetCall Telecom@
- NetNumber, Inc.
- Provider of ENUM technology to the wireless and wireline telecommunications market.
- NETXUSA, LLC
- Distributor of VoIP, voice mail, unified messaging, and other computer telephony hardware and software solutions.
- NextAdvisor.com: VoIP Internet Telephone Comparison
- Compare VoIP services and read reviews at NextAdvisor.com.
- Nx Networks
- Offers a suite of telephony and data networking solutions.
- OnSIP Hosted PBX
- Virtual PBX service for businesses of any size. Customers use any IP enabled phones to connect and get outsourced business class voice services with no cost per user, seat, or extension.
- Paltalk
- Chat with users in live voice and video chat rooms for free.
- PC2Call
- Offers Internet telephony and voice over IP services. Provided by Vectone.
- Phonevite.com
- Plan or announce upcoming social events by sending personalised voice messages to friends simultaneously via Internet telephony technology.
- pulver.com
- Provides community for the Internet telephony industry through conferences, newsletters, mailing lists, analysis, liaison roles, and more.
- PushNCall.com
- Immediately connects Internet users with companies they want to talk to with the push of a button. For enabled web sites, email, and banner ads.
- Quintum Technologies, Inc.
- Tenor VoIP MultiPath Switches and Gateways from Quintum drop into PBXs or IP PBXs and branch offices to offer nonstop call quality and easy remote management.
- Solution4VOIP
- Complete IP telephony platform offering a variety of services including wholesale VoIP termination, device to phone support, PC to phone and web to phone services, calling cards, SMS/ANI/WEB callback, and more.
- Stimulus Technologies
- Offers business-class VoIP phone service in the Las Vegas area.
- SysMaster Corporation
- Provides VoIP billing server, VoIP gateway, IPTV, and Wireless equipment to telecommunication companies and service providers.
- Tangerine, Inc.
- Developer of VoIP call managers for enterprises and carriers.
- Taridium
- Specialises in VoIP solutions for open standard enterprise and service providers. Includes enterprise PBX with hardware, configuration, and support.
- Telchemy
- Develops Quality of Service monitoring software for Voice over IP gateways and other multimedia systems.
- Telecom Informacia
- Voice over IP (VoIP) solution provider and system integrator offering customer management and billing solutions for entrepreneurs, carriers, VoIP Calling Card operators, and other corporate companies.
- TeleGea, Inc.
- Provider of software solutions for the rapid delivery of IP communications services including IP-VPN and VoIP.
- TringMe
- Web-based telephony to keep you connected.
- VarPhonex
- Offering Internet calling, Internet telephony devices, and other unique telecommunications services.
- Verso Technologies
- Provides Voice over Internet Protocol (VoIP) technology to deliver integrated switching solutions for service providers.
- Vocalcommerce.com
- Features voice over IP programme. Adds web-to-telephone functionality to Internet sites.
- VocalTec Communications
- Telecom equipment provider offering packet voice products and services for carriers and service providers.
- Voice Over IP Calculator
- Offering free VoIP resources including online bandwidth calculators, white papers, books, and a directory and forum.
- Voice Reports VoIP Comparisons
- Voice reports features an online tool to compare VoIP providers along with customer reviews of popular VoIP providers.
- VoiceConX
- Provides hosted telephone services and voice self-service solutions for a variety of business needs.
- VoIP Judge
- Contains VoIP reviews, news, and forums.
- VoIP Providers List
- Source of information on IP telephony providers and related VoIP services worldwide.
- VoIP2Save.com Internet Telephone
- Provides unlimited worldwide calling plans for a low monthly flat rate.
- VoIPOnline.com
- Offers news, discussion forum, links, and more.
- VoipSupply.com
- Online reseller of VOIP, IP, and IP telephony equipment.
- VoIPWatch
- Offers news, acronym dictionary, surveys, mailing list, links, and more.
- Voyant Technologies, Inc.
- Offers enhanced voice and conferencing solutions for switched and IP-based networks.
- Which VoIP Service Provider
- Compare residential and business VoIP service providers. Features VoIP reviews, forums, blogs, articles, and free VoIP plan search engine.
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