Ever wished you could develop your own Real-time Communication application? Well, it’s time for that dream to become a reality! We will go out through the world of SIP and WebRTC and create an individual VoIP application that will look attractive.

SIP stands for Session Initiation Protocol, while WebRTC refers to Web Real Time Communication, you may wonder.

SIP (Session Initiation Protocol): SIP can be considered as the traffic directing mechanism of the internet. It also assists in scheduling, conducting and closing multimedia sessions for instance; voice and video call.

WebRTC (Web Real-Time Communication): This is the trick that makes real time communication in the browser possible. It provides a way of having two devices connecting to each other directly, without recommending the use of a server.

SIP and WebRTC alongside can be seen as the foundation for the development of VoIP applications.

Great! Time to embark on the VoIP app journey.

Choose a programming language: JavaScript is one of the most used languages in web creation, and it is compatible with WebRTC.

Set up a signaling server: It forms a concept of a server through which the clients (your app users) can search for each other and share data.

Integrate SIP: As mentioned earlier for handling the SIP protocol interactions, one has to use a SIP library such as JS SIP.

Implement WebRTC: You have to create your peer-to-peer connections and exchange will happen through media streams using the JavaScript SDK in WebRTC APIs.

Here's a breakdown of the steps involved:

User A initiates a call: The app then sends INVITE message to the signaling server of User B.

Signaling server relays the INVITE: Now the server locates User B and forwards the INVITE.

User B accepts the call: Meanwhile, User B’s app gives User A a 200 OK later on.

WebRTC connection: The apps leverage the use of WebRTC to devise a direct peer-to-peer contact between the associated apps.

Media exchange: The users begin to exchange the streams of audio and video data.

Remember the word possible has so many more letters than improbable! You could build video conferencing app, real time chat or even build a virtual classroom. The choice is yours!