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Welcome to voip.about.com, your guide site to everything Voice Over IP, also called VoIP, IP Telephony or Internet Telephony. Learn how to make free or cheap local and international calls using your PC or phone. Stay updated on VoIP hows and whats, V...

Linphone, Free SIP VOIP client, open-source voip software for Linux, windows, mac, iphone, android. Free sip voip sdk.

The Award Winning Business Phone Service over the Internet. OnSIP business VoIP service is a hosted pbx system that allows you to streamline your business communications. There’s no phone company hassle, no phone system to buy or manage, no contracts

The fastest and easiest way to get a SIP account for free video calling over the Internet. Register your SIP address with any VoIP phone or use our free internet phone for secure calling.

3CX VOIP PBX - provides an easy to use, plug and play SIP - IP PABX for Windows. With a software based IP PBX you will save on PBX maintenance and halve your phone bill. Download the FREE edition today and break free from your proprietary phone syste...

Free Zoiper softphone, Web Phone & SDK for windows, mac, linux & mobile phones. Get your own OEM branded and customized softphone. Free Download

This is the VoIP SIP Broker service. SIPBroker is a free open peering service.

VoIP Service Provider Home Phone Internet Phone Service Small Business SIP Trunk Solutions Free Cheap International Calls Virtual Number.

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Our toolkits, softphone SDKs, provide much more than just SIP, voice and video: we have integrated the latest standards for optimized NAT traversal (ICE), security (TLS and SRTP) as well as all advanced SIP scenario (supervision, call transfer, call ...

Office SIP Server is free VoIP and Instant Messaging Software