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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...

Office SIP Server is free VoIP and Instant Messaging Software

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

AsteriskWin32 - Open source PBX and VoIP for Windows.

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Asterisk is free software that transforms a computer into a communication server. Asterisk lets you build applications like PBX, VoIP gateway, IVR and ACD.

Voxilla has been a trusted source for accurate, up-to-date information on the IP Communications industry since 2002. A dedicated staff of reporters and engineers produce feature articles and product reviews to keep industry watchers abreast of the p...

IT Best Practices, How-tos, Product Reviews, discussions, articles for IT Professionals in small and medium businesses

MaximumPC brings you the latest technology news, computer mods, computer news and the latest computer and notebook reviews. Read the latest PC news

Vodia offers PBX software for enterprises and service providers. Vodia

SIP Hosted PBX, Multi-Tenant, VoIP Platform for Service Providers - provides scalable and reliable SaaS IP Telephony Platform. Based on the Session Initiation Protocol (SIP), the Brekeke products provide robust SIP Communication Platform for Service ...