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.

iConnectHere
Offers VoIP-based PC-to-Phone, Broadband Phone and Calling Card services.

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.

ISPhone Inc.
Wholesale voice over internet services.

MeaPhone
PC to phone service based in Thailand. Software download required.

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