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IP and IT telephony are essentially the same thing. This kind of telephony is becoming more popular with each new day. Until recently, the Internet and the phone were completely different things, which could not unite in any way. Now, there is IP (IT) - telephony. This is such a kind of communication, thanks to which a user of a personal computer can easily call relatives, friends or colleagues without getting up from the workplace. In this case, communication with another user will be done using the Internet itself or some other IP-network.

History of appearance and use

The very technology of communication has appeared for a long time, still in80th years. Actively spread and use the technology of IP-telephony became already in 1995. Those technologies that were used before, do not go to any comparison with what is used today. For example, sound compression was previously performed using GSM-technologies. Until recently, this technology was not used in Russia, and in the United States of America it was used only about 7 years ago. Today, for the transfer of information (including compression and decompression of sound), completely different technologies are used that bring IP telephony to a completely different level.

Advantages of IP-telephony

Such a type of communication has a largenumber of advantages. For example, from the economic point of view, to implement such calls, using IP-telephony, a person will spend much less money. It will be even more relevant if the person often makes long-distance or international calls. The next advantage is that a person can easily make a call either on the computer of the interlocutor or on the phone. In order to use IP-telephony, you need to connect special gateways for IP-telephony. With these gateways, the user just gets the opportunity to make a call to both the phone and the computer. The principle of this telephony is that this gateway, which on the one hand should be connected to the phone, and on the other to the IP network, receives a special signal and digitizes it. Then, after this process is completed, the incoming signal is divided into special data packets and compressed to the optimal size. Then this data is sent to a special address.