Skype related question

Sorry to use this forum to ask about it, I’m sure I should ask in some Skype related Forum, but sadly Skype Support Site isn’t that good to leave questions, but for sure someone here can help me.

Whenever I start Skype, after I log in, it tries to receive internet connection, usually the IP changes. I always tell Comodo to block it, and Skype continue to works ok anyway.

Is this normal? Is there something wrong in my Skype/PC?