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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...

Find unified communications (UC) news, advice and research for IT professionals and learn about strategies for UC deployment, integration and management.

Learn about wireless networks, Internet and general computer networking solutions. Study our home networking tutorials, practice tests, and other reference material. We cover all popular computer networking topics including wireless home network setu...

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...

Business Grade SIP Trunking for enterprises. Save 40% or more! Flexible plans and pricing tailored to meet your exact communication needs. Get started today at nexVortex.com

It offers beginner tutorial on aspects of Internet Multimedia. It has tutorials on SIP, RTP, SDP and issues of audio video media and info on multimedia devices like SIP phone or multimedia projectors.

Comcast Business Services offers high speed broadband internet, phone, digital cable, and ethernet data service to businesses of all sizes.

Nokia Developer helps developers build mobile phone apps that delight consumers on Nokia Lumia, Nokia X and Nokia Asha platforms.

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

Top vendor of IVR platforms and IVR hosting for enterprises, call centers, and IVR developers. Easy, free trials, excellent customer service.