How to start skype through squidguard (whitelist)

Question

Skype

Greetings!
No one faced the following problem:
There is a proxy server with squidguard configured in whitelist mode for ordinary users, i.e. Everything is forbidden except what is allowed.
What domains or ips need to be allowed so that Skype can log in and then make calls?
Collecting access.log helped only in the issue of user authorization (about 30 ip-addresses), but there is a problem with messages and calls. Doesn't let you call.
Looking through tail -f /var/log/squid/access.log | grep "ip-machine where Skype is located" - then a bunch of addresses pop up there, I tried to add everything, but it does not help.