The 'skype' name in the network requests is more a remnant of a last minute change from the internal product name (Skype Teams) than a statement of the technologies underpinning the product.

The Teams comms/meeting stack was its own thing - an evolution (or frankenstein's monster mix) of Skype for Business and Skype Consumer technologies. That is one of the reasons why Teams did not have interop capabilities with SfB at launch.

Side note: The Skype for Business communications stack is a descendent of Lync/Office Communicator was completely separate from Skype Consumer (only thing it shared was branding).

Source: worked on Teams

that would explain why skype was horrible in mobile. notification arrived late, messages coming late. thanks god Microsoft Teams is different. I hope Microsoft Teams doing its job better on mobile.