Truphone saves you money on mobile calls by routing calls via the internet. We don't believe in roaming charges, so call prices are simple and low from anywhere on the planet (see how cheap mobile calls are with Truphone).

Original Website - http://www.asterisk.org/ Asterisk is a complete PBX in software. It runs on Linux, BSD, Windows (emulated) and OS X and provides all of the features you would expect from a PBX and more. Asterisk does voice over IP in four protocols, and can interoperate with almost all standards-based telephony equipment using relatively inexpensive hardware.