Conversational Voice$-$ and Video$-$over$-$IP: Real$-$time conversational voice over the Internet is often referred to as Internet telephony, since, from the user$$s perspective, it is similar to the traditional circuit$-$switched telephone service. It is also commonly called Voice$-$over$-$IP $($VOIP$).$Conversational video is similar except that it includes the video of the participants as well as their voices. Conversational voice and video are widely used in the Internet today, with the Internet companies like Skype and Google Talk boasting hundreds of millions of daily users.

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