HOW VoIP Works?
Our phone uses analog signals to communicate between two phones. In VoIP this analog signal is converted into digital data and transmitted to servers and used for communications. Some VoIP’s are free, some cost you a fraction of a cost of regular mobile phone. Commonly the digital data is encrypted using SSL (secure socket layers) and some with ZRTD.
WHAT IS SSL AND HOW IT WORKS?
SSL or Secure Socket Layers is protocol to encrypt digital data. The sol protocol was originally developed by Netscape and released to public in 1996. Its newer version TLS (Transport Layer Security) which is based on SSL 3.0.
How SSL works
SSL use a program layer between HTTP (hyper text transfer protocol ) and server side TCP (Transport Control Protocol). TCP convert data into packets also guarantees that packets will be delivered in the same order in which they were sent. SSL consists of public and a private key encryption systems RSA algorithm (Rivest-Shamir-Adleman algorithm) which includes use of digital certificate. The whole system encrypts the data sent over HTTP with a secure layer and makes it more secure. Oops am deviating from my topic… lets comeback to the main topic 
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.Installing iCall
You can download iCall software from their Company Website and its available for almost all the platforms including windows (X86 or 32bit and X64 or 64bit), LINUX, IOS, MAC and Android.
Go to the download page (icall.com/get) then download it and install it, in the mean time you have to register your account (icall.com/registration). After that you give your Login details to the installed iCall software. You can use the free version to call continuously for 5 minutes after that your call will get disconnected but you call make unlimited calls for free. Now are you ready to make international calls for free?
Note: For now this is FREE only for users in US and Canada… So we need to make some proxy setting to use it in other countries. Will provide the detail of Proxy Setting soon 
If you have any questions please feel free to comment here…
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