"For the last few years I had been working when time was available on what is called the GNU Telephony Secure Calling Initiative.This initiative was originally started specifically to make passive voice communication intercept a thing of the past using free software and public standards, and came out of ideas from and the work of the New York City civil liberties community and New York Fair Use in

"...GNU Telephony Secure Calling is intended to make it both possible, and easy, for individuals, private organizations, and public institutions to deploy secure realtime voice and video communications (VoIP) both in closed and openly accessible networks, and to do so in a manner which helps make passive and warrantless communication intercept of private communication a thing of the past.

Asterisk is becoming an increasingly popular way for organizations to deploy Voice over IP (VoIP) without making a huge investment in proprietary systems. One of the major hurdles to get over when deploying Asterisk is to learn how the different configuration files work together and how to configure the system to answer phones.