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not so much really as far as I can see in the description, it just avoids some extra double-speaking and some extra information but not a huge ammount of things imo.
Anyway, in order to figure out if it's on, you can press insert+n with NVDA running, then go to tools submenu, and choose Manage add-ons. In the add-ons list, you'll see Skype; make sure it's on, not off.
[Note that since I am using NVDA in italian, translation might not be correct.]