I am trying to build a simple chat application. But it requires Voice calls functionality to other users. I would be using Firebase for messaging. Does Firebase have Voice calls support? I can configure external SIP
Enable AuthenticationThis app will use Firebase Realtime Database to store all chat messages. Before we add data, though, we should make sure that the app is secure and that only authenticated users can post messages. In this step, we will enable Firebase Authentication and configure Realtime Database Security Rules.
Firebase In-App Messaging helps you engage your app's active users by sending them targeted, contextual messages that encourage them to use key app features. For example, you could send an in-app message to get users to subscribe, watch a video, complete a level, or buy an item.
If you want to create voice call or video call app, maybe you can use WebRTC technology.
WebRTC is a free, open project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs.
There is a nice presentation here
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