Hello!

This button has another purpose than to create private call with profile's owner. It intends for creating group calls on profile's page with friends. When someone clicks to the button push notifications are sent in the same moment to the all friends.

It is useful if you like to create seminars on something like that. This button can be hidden from Studio -> Navigation -> Persons -> Person Actions area.

We will modify this function in the future updates and to make it to work to create private calls only.