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In a nutshell, VOIP is a set of applications that let you to make telephone calls over the Internet. VoIP was originally developed to provide voice communication between computer users in different locations. Someone on a computer equipped with a microphone and headset can talk to another computer user likewise equipped.
In a VOIP call, your voice is first converted into digital data. This is done by 'sampling' your voice -- dividing the analog sound signal into discrete steps that can be assigned a number value.
In order for a Wi-Fi VOIP phone call to work, you have to be in range of a Wi-Fi network ... Continue Reading Here..)