Avast preventing Skype from making calls

In order to make a new call, or receive any calls, I have to disable Avast.

When people try to call me while Avast is enabled, nothing happens on my side. I don’t get any notification.

Once the call has been started, I can enable avast again and the call does not drop. It’s only to initiate the call.

I’ve been using Avast (paid) for around 3 years. This problem has persisted for almost 1 year.

First question: Is there a way to create an exception for this? I’ve tried before with no luck.

Main question: Why? This is an extremely popular application that should not be having these types of issues.

https://www.avast.com/faq.php?article=AVKB25