Why does the user's call not go, but goes back?

Question

Skype

Skype latest version for both users. Both are online and see each other (Online status). When calling user A, user B, B - does not receive a call. If B > And the call passes. Both are clean on the blacklists. If A calls others, they see.
Please tell me what could be the problem?

Answer 1

Put the same OS or put up)

Or use the web version.