Yeah, if you look at the network requests Teams makes, many of them include 'skype' in the name. Only thing I went off to guess it is a lot of the same services.
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