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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

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...

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...

IP address lookup, location, proxy detection, email tracing, IP hiding tips, blacklist check, speed test, and forums. Find, get, and show my IP address.

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.

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

Every day a new Tip about Office 365

Microsoft Lync Server tips, tricks, issues, troubleshooting, diagnostics, reporting, features, information and tools. This include Microsoft Lync Server, Lync Client, Microsoft Lync Conferencing Add-In, and Microsoft Lync Online. Information on migr...

Dan York on how Voice over IP is rewriting (almost) everything you thought you understood about telephony...

Business VoIP - OnSIP Hosted PBX and Hosted VoIP Trunking. No per user license fees makes our Hosted PBX service the most economical for your business.