You cannot make use of these MS Teams API's without having a Teams app. You will need to register an app, get an access token with required permissions and use that token to make the graph call. Also, it is not possible to initiate a teams call from an external application.
MS Teams APIs for web integration
Saeed
6
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Hi, we're working on a website that provides live group video calls, chat and calendar functions.
I basically need to know if I can use MS Teams APIs to integrate live video calls (and other functionalities such as chat) into my website so users can host or join calls through our website (and without going to MS Teams directly).
I appreciate any info you can provide.