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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...

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Sangoma is a leading provider of hardware and software components that enable or enhance IP Communications Systems for both telecom and datacom applications.

AVOXI virtual call center solutions provide virtual call center products like SIP trunking and VoIP gateway solutions, with international toll-free numbers.

Multi-Tech Systems makes M2M communications effortless. Find quick to market and reliable external and embedded modems and Unified Communications products that connect data over cellular and analog networks from anywhere in the world. As a 40-year in...

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

Cisco (NASDAQ: CSCO) is the worldwide leader in networking that transforms how people connect, communicate and collaborate.

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