I rent out my home and had Comcast voice, at least until last summer when I swapped it out for a MagicJack, but I don't think things have changed since then.
Comcast voice provides free unlimited domestic calling. Not sure about Canada and Alaska. As the account owner I could have Comcast block all calls which would incur extra charges, like international, collect, 900 numbers, & directory assistance. If you wanted to call internationally, you need to use a calling card. Your landlord has probably done this but you might want to check with them.
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