Based on this architecture, VoIP calls are delivered in three key phases. These are:
1) Audio is digitised
As you speak into your device’s microphone (laptop, mobile or headset), the audio signal is digitised by your VoIP application. This data is then broken up into pieces called packets and each is given a unique label.
2) Data travels over the internet
Your call is made up of different packets of data. Each packet of data travels over the Internet to the recipient.
3) Data is decoded and reassembled
When the data arrives at the end destination, it is put back into the correct order. The data is then converted into audio and the recipient hears what you said.
Interestingly, the data packets don’t necessarily arrive in the order they were sent. This is because VoIP ensures that each data packet is routed to the recipient using the most efficient route across the internet.