VoIP (Voice over IP)
VoIP is the concept of sending voice packets. The technology has greatly advanced now and instead of getting packets individually and with gaps, the better technology allows them to be instant and one can hold a live conversation with its help.
The technology is not very old and it first came to limelight a little over a decade ago where the quality was improved enormously. Being very cheap or in cases free also adds to the popularity. Now there are software applications that also allow the use of VoIP services on a cell phone that has the right operating system.
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SIP (Session Initiation Protocol)
It is an application layer protocol that was designed to manage multimedia sessions such as VoIP. It can manage all issues including starting a call, modify the current call by adding more people to it and terminating it. It also has the ability to generate bills for such sessions amongst a number of other functions that it performs.
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