- Astawerks - Supplier of VoIP Phones, Channel Banks,ATAS from AASTRA, Digium, Linksys, Rhino, Netgear, Sangoma, Audio Codes, UTStarcom
- Asterisk - An open source telephony switching and private branch exchange service. Allows peer-peer calling using a variety of voice over internet protocols
- Asylum Telecom - VoIP provider for business and residential customers. No service charges
- AT&T CallVantage Service - Broadband phone service from AT&T. Consumer VOIP plans includes unlimited calling within USA and Canada
- BroadVoice - VoIP provider offers full feature set with voice mail, caller ID, etc. Requires supplied broadband phone adapter
- Callconomy Solutions - Provides international VoIP call shop services. Includes FAQ
- CallDaddy - Pre-paid VOIP services. H.323 IP phone, gateway, gatekeeper, NetMeeting or any other H.323 compliant terminal necessary
- Calleveryone.com - A full featured VoIP/broadband phone to phone service primarily for calls within the US
- Callserve - PC-to-Phone service for outbound calls only. Software download required
- Calltower, Inc. - US-based B2B VoIP provider offers enterprise class hosted VOIP PBX Systems
- Click4netphone - Pre-paid Internet Telephony Services via VOIP
- Dialpad Communications, Inc. - Offers monthly billing and pre-paid PC-to-Phone VoIP services. Also supports broadband telephone adapter for use without PC
- Dow Networks - Provides Voice over IP and telecom service to international clients
- Efonica - Prepaid system for PC-to-phone and web initiated phone-to-phone using VoIP
- Evolve Communications - Vancouver, Canada based provider. Includes rate plans, description of technology, and FAQ
- Free World Dialup - Community network allowing calls to toll free numbers in the US, Japan, UK and Netherlands. Peer-peer calling to other members
- IPCB.net - Softswitch services such as routing, billing as well as voIP call termination
- IPgrade - B2B Wholesaler of voIP-based Phone-to-Phone, PC-to-Phone, DDI, VPN, CRM, prepaid calling cards, and broadband services
- iPhone - combines three products - a revolutionary mobile phone, a widescreen iPod with touch controls, and a breakthrough Internet communications device with desktop-class email, web browsing, maps, and searching - into one small and lightweight handheld device. iPhone also introduces an entirely new user interface based on a large multi-touch display and pioneering new software, letting you control everything with just your fingers. So it ushers in an era of software power and sophistication never before seen in a mobile device, completely redefining what you can do on a mobile phone
- ISPhone Inc. - Wholesale voice over internet services
- MeaPhone - PC to phone service based in Thailand. Software download required
- My voIP Store - Australian-based (Brisbane) voIP consultant and B2C e-commerce site for voIP hardware
- Mywebcalls - PC-Phone or device-to-phone United Kingdom based service
- On Instant - PC-to-PC only isntant messaging service with voIP features including live voice, voicemail and CRM tools
- One Unified Net - A communications infrastructure provider includes IP systems, services, softswitches, and phones
- OneAccess Networks - Broadband access solutions including IP routers, voice over IP (voIP) and voice over DSL (VoDSL) solutions, concentrators and networks adapters
- Onramp Access - Provides business oriented voIP services across fully managed T1 connections
- Packet8 - Voice over internet direct dial service without a PC. Owned by 8X8, Inc
- PC2call - PC-phone internet voice service provider based in the United Kingdom
- PingTone - Business voIP provider geared toward companies deploying Cisco Systems IP Phones
- Reach Out IT, Inc. Technology Outsource - voIP telecom consultants serving Massachusetts, Rhode Island and Connecticut. Implements Linux-based open source Asterisk PBX systems
- RhinoBell - PC to phone, phone to phone using device, voice over internet calls
- SCS Telecom GmbH - German-based B2B voIP provider offers services to local call-shop owners and calling card telcos
- SIPphone Inc. - Peer-peer calling service. Requires SIP adaptor and phone
- Skype - Peer to peer internet voice service. Mac, Windows and Linux versions available. Users may call landlines and cellphones for a fee; users may call each other for free
- Snaptel Communications - Offers pre-paid PC-to-Phone voIP services worldwide. Uses Netmeeting
- SunISP - SIP based voIP phones and service plans with focus on Caribbean and South America
- Super Technologies, Inc - Offers flat-rate unlimited calling within USA & Canada. Uses analog telephone handsets via broadband telephone adapter
- Talafone - Canadian based provider of PC-to-phone and IP phone services and hardware
- Texas Instruments voIP Solutions - B2B manufacturer of voIP equipment including IP Phones, voIP Gateways, High Density Gateways, voice-enabled Cable & DSL Modems
- Truphone - saves you money on mobile calls by routing calls via the internet. We don't believe in roaming charges, so call prices are simple and low from anywhere on the planet
- v59 - Use dial-up and talk everywhere with our voIP service
- Via Talk - provides the most cost effective, complete broadband phone service package available to United States residential and business customers. Our unparalleled 24/7 technical support team coupled with our state of the art fiber optic network ensures you that you will have the highest available quality of service
- Via Talk Free - do not pay a penny to make quick calls just enter your area code and phone number with the number your are dialing and enjoy up to 10 minutes on ViaTalk
- Vinculum Communications - voIP wholesale international termination services provider
- VocalNet - voIP provider offering residential and business plans
- Voice over IP Calculator - Free voIP resources, including online bandwidth calculators, white papers, books, a directory and a forum
- Voiceglo - voIP service offering free and paid plans. Some plans require phone adapter or USB phone with an Internet-connected computer
- VoicePulse - voIP service offering phone-to-phone with device. Various features and calling plans
- VoIP Service - iCallglobe, one of the leading VoIP service provider offers enhanced quality VoIP call termination services, business VoIP solutions, wholesale carrier services and VoIP reseller programs
- VoIP.com - Provides a variety of VoIP Internet phone service plans and rates. Serving residential and business customers
- VoIPOnline - Voice-over-IP news, supplier directory and chatrooms for discussing related industry topics
- VoipXchange - B2B voIP exchange platform for carriers to buy/sell excess capacity on voIP networks covering call termination in 250+ countries. No-fee membership required
- Vonage - Provides voice over internet local dial-tone service. No PC required. Uses analog telephone with broadband telephone adapter
- Voxilla - News, forums, reviews and guides for IP telephony devices and services
- WERCS Communications - US-based B2B voIP telephony provider offering converged ip voice and data network services to customers in Wyoming and Rocky Mountain region
- WhistlerTel Inc. - US provider of broadband internet phone service and voice over IP (voIP) solutions
- World On IP - Italy-based B2B voIP provider offering hardware to set-up wireless voIP networks