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I believe Skype transitioned to client-server-client some time ago to allow for Mobile-Mobile skype calls and similar.

P2P may still be available (someone with some time and a packet sniffer could check?), but it is not the way most people use Skype these days.

It's P2P on desktop if you forwarded ports or if UPnP works correctly. Skype has documentation on how to check this over here: https://support.skype.com/en/faq/FA1544/is-my-call-being-rel...

Thank you!