2. What is VoIP? VoIP [Voice over Internet Protocol] is family of communication protocols and transmission technique which is used in delivery of voice communication or multimedia sessions over internet.
12. VoIP Devices  ATA: Most useful device for VoIP is ATA(Analog telephone Adaptor). It helps you to connect your standard phone to computer and lets you call.
13. Continue  Computer-to-computer : Its the easiest way to make VoIP calls. You just need to have a software, microphone, speaker and sound card (and internet connection obviously ! ! !). There are not any additional charges for this.
14. Continue  IP Phone : This look like just a simple phone with the headset and different buttons. IP Phones connect directly to your router and contain all the necessary software and hardware to handle the IP calls.