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Asterisk
An open source telephony switching and private branch exchange service. Allows peer-peer calling using a variety of voice over internet protocols.
http://asterisk.org
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Asylum Telecom
VoIP provider for business and residential customers. No service charges.
http://www.asylumtel.com
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BroadVoice
VoIP provider offers full feature set with voice mail, caller ID, etc. Requires supplied broadband phone adapter.
http://www.broadvoice.com/
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CallDaddy
Pre-paid VOIP services. H.323 IP phone, gateway, gatekeeper, NetMeeting or any other H.323 compliant terminal necessary.
http://www.calldaddy.com
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Calleveryone.com
A full featured VoIP/broadband phone to phone service primarily for calls within the US.
http://www.calleveryone.com
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Callserve
PC-to-Phone service for outbound calls only. Software download required.
http://www.callserve.com
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Dial2Home
VoIP service for phone-to-phone with adapter or peer-to-peer.
http://www.dial2home.net/
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Dialpad Communications, Inc.
Offers monthly billing and pre-paid PC-to-Phone VoIP services. Also supports broadband telephone adapter for use without PC.
http://www.dialpad.com
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Dow Networks
Provides Voice over IP and telecom service to international clients.
http://www.downetworks.com
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Efonica
Prepaid system for PC-to-phone and web initiated phone-to-phone using VoIP.
http://www.efonica.com
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iConnectHere
Offers VoIP-based PC-to-Phone, Broadband Phone and Calling Card services.
http://www.iconnecthere.com/
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IPCB.net
Softswitch services such as routing, billing as well as VoIP call termination.
http://www.ipcb.net
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ISPhone Inc.
Wholesale voice over internet services.
http://www.isphone.net/
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MeaPhone
PC to phone service based in Thailand. Software download required.
http://www.meaphone.com
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Mywebcalls
PC-Phone or device-to-phone United Kingdom based service.
http://www.mywebcalls.com/
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On Instant
PC-to-PC only isntant messaging service with VoIP features including live voice, voicemail and CRM tools.
http://www.on-instant.com
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One Unified Net
A communications infrastructure provider includes IP systems, services, softswitches, and phones.
http://www.oneunified.net
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Packet8
Voice over internet direct dial service without a PC. Owned by 8X8, Inc.
http://packet8.net
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PC2call
PC-phone internet voice service provider based in the United Kingdom.
http://www.pc2call.com/
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Redshift Networks
Operates and builds international carrier networks using VoIP and TDM circuit transmission technologies.
http://www.redshiftcorp.com
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