Voice over internet or Intranet Network (any network using Internet Protocol) or VoIP is a technique used to connect the audio talks. So any number of people connected together by one network can talk over telephone using the technique.
This service began to emerge across the Internet in 1995 by a small company named Vocaltec which enabled Internet users to save large sums they pay for making international telephone communications.
The development of the first computer programme whose users can communicate with each other does not require but a sound card , microphone and an Internet, but the sound transferred was not of the same quality of that transferred via public telephone networks. Yet, it was an indicator that the sound transfer through the Internet is possible and promising.
Telephone calls through the Internet are no longer restricted to computers, but also through phones supporting this technology. Moreover , the transfer of voice via the Internet has many advantages such as providing telephone calls, conferences meeting, voice messages and other with a minimal cost both for users and service providers as what was monthly paid by the user in return for the service is a fixed subscription apart from the communication is open around the clock. The cost of international calls through such a technical is cheaper than any other means of communication. Since this technology relies more on software than hardware, its maintenance is very easy and less costly.
Just for using VoIP , you will need an Internet joint with a wide range compass such as rapid service lines, such as (DSL), (Routers) , telephone joints, sound card ,microphone ,headset, and the "Internet Phone” program.
The main disadvantage which appeared in 1995, is the lack of the capacity of the broadband, and on this basis, the software used with modems has poor sound quality when compared with a normal phone call.
In 1998, the rate of using VoIP traffic increased to represent approximately 1% of all voice messages in the USA and it becomes possible for PC to connect with a phone and the same applies among phones.
Meanwhile, network companies such as Cisco and Lucent provided equipment that can run VoIP Traffic. As a result, VoIP has become to be representing more than 3% of all voice messages by 2000.
Among the well- known and leading companies in this area is Skype which emerged in the mid-nineties, and there are a range of other programs such as Net.2Phone, PC2Call, and ZeroPhone.