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.

BroadVoice
VoIP provider offers full feature set with voice mail, caller ID, etc. Requires supplied broadband phone adapter.

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.

Dial2Home
VoIP service for phone-to-phone with adapter or peer-to-peer.

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.

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