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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.

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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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Charged with improving access to transportation focused materials needed by federal, state, and local decision-makers, the National Transportation Library

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

Texas Instruments (TI) is a global analog and digital semiconductor IC design and manufacturing company.

Granite Island Group is the International Leader in Technical Surveillance Counter Measures, Telecommunications Security, Counterintelligence, and Technical Security Consulting.

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 ...

Polycom ist der weltweit führende Anbieter standardbasierter Unified Communications (UC)-Lösungen zur Nutzung von Telepresence-, Video- und Audiofunktionen auf der Polycom® RealPresence™-Plattform.

Polycom - The worldwide leader in unified communication and collaboration, video conferencing, voice conferencing, data and Web communications solutions.