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The information technology industry is a constantly changing field, with new information and technological advances occurring on a regular basis. We all know that technology has evolved from a number of stages, and now we live in the modern era of information technology, to keep pace with the rapid development of the industry, and maintain the relevance of the career, diversity. Your certificate is critical. After all these years, we have switched from the PSTN to VoIP. In large organizations, each employee communicates and cooperates with each other to complete the work. To do this, the company needs some systems so that calls can be made between employees. There are two solutions: one is the PSTN and the other is VoIP. We cannot use the PSTN because it is not economical for the company. The second option is to switch to VoIP. Sending analog sounds in IP packets as 1 and 0 iscalled an Internet Protocol voice.