Περίληψη:
In this project we describe the voice over Internet protocol (VoIP) technology and how to install a VoIP system via asterisk. Initially we will present an introduction to traditional telephony in order to clarify the differences between the two types of voice transmission. Then we will address the advantages and disadvantages of VoIP technology. We will also present a detailed description of VoIP protocols and, how we could use them to make voice and video calls via the Internet. Finally, we will show how we can setup a Voice over IP service via Asterisk.