VOIP PBX

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http://zfoneproject.com/

VOIP Encryption

Zfone™ is a new secure VoIP phone software product which lets you make encrypted phone calls over the Internet.
With 3CX Voice Application Designer (VAD) you can create voice applications with a few mouse clicks that automate time intensive business processes. For example, create a voice application that queries the caller for a customer number, then validates this number against a database and routes the call based on customer type. http://www.888voip.com/products/3cx-voice-application-designer.html

3CX Voice Application Designer -888.Voip.Store

Adhearsion: Open-Source Telephony Development Framework

http://adhearsion.com/ Dynamic call routing, integration with databases and CRM software, screen-pops, call monitoring & flexible media routing. Adhearsion fits into a Call Centre stack perfectly, and has much lower operational costs than expensive proprietary solutions.

Twilio Cloud Communications | Web Service API for building Voice and SMS Applications

Audio pipes that turn every application into a phone. Connect your users across web browsers, mobile phones, tablets, and even traditional phones. http://www.twilio.com/