In the past few decades, the technology of voice signal transmission between two sets has still not changed ; as the d igital technology has already made multiple exchanges that make the call quality clearer and efficient. If we take a glance at the 1990s, the very first software that allows calls to be made over the internet appeared. But at that time, most of the people had comparatively slow dial-up connections so the new Voice over Internet Protocol (VoIP) technology had very few customers. Then with the passage of time, after the 2000s, when the internet connections become more reliable, faster and efficient, the VoIP technology has also become more advanced and even cost-effective for common people. VoIP for business use: When VoIP started out and being used by different individuals, businesses have also been quick to check its potential. With different companies offering high-quality VoIP solutions , call centers also considered taking benefit from its lower