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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...

SipToSis SIP Skype Gateway Software Bridge - Amateur Radio - UHF preamplifiers - Duplexers - Sip-Thee-Skype Skype to Sip Proxy Gateway Bridge Converter Adapter. Asterisk to Skype Interconnect Gateways. Product and Service Reviews

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

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

VoIP Chips, VoIP Media Gateways, VoIP Media Servers, VoIP Session Border Controllers, VoIP Security Gateways & VoIP Value Added Applications developed by AudioCodes, leaders in the VoIP market for VoIP equipment and VoIP technology

SIPSorcery is a combined SIP service and web application that can manage all your SIP devices and SIP providers.

SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory

Running a small business. Learn how to operate and grow a business with information from accounting and bookkeeping to how to obtain small business financing, get ideas for franchises and more.