I would recommend Amazon Chime. If I were you, I would eventually look into working with WebRTC as it is very interesting and teaches you a lot. I dove deep into webRTC recently building a webinar broadcasting application (one-to-many) and I can say it is difficult to understand how things actually work and to get it stable. I mean you can vaguely read up on it and get some things to work by copying code on StackOverflow or using a library but that wouldn't teach you much.
In short, go with Chime because it is easy to get started especially if you have a time constraint. But look into webRTC in the future as it enables you to build your own "Chime". Hope this helped!
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