Skype for meeting broadcast. Office 365. Blocking all domains?

[Robert Bollinger]

Hey Guys, 

Going through some documentation here: https://docs.microsoft.com/en-us/skypeforbusiness/set-up-your-network-for-skype-meeting-broadcast/se...

In this documentation its saying to block all domains except for the these 4: 

• noammeetings.lync.com

• emeameetings.lync.com

• apacmeetings.lync.com

• resources.lync.com

My quesiton is if you block all domains except those for Skype for meeting broadcast, wouldnt that break all other external communications? And why do you have to block any domains, or add the above domains? Couldnt you just allow the broadcast meetings to run with the default domains in place (assuming all domains are allowed). ? 

Thanks, 
Robert

[#2]

Yup, you are right. Either the article is making some assumptions or it's simply wrong. You can leave feedback directly on the article, it goes straight to the documentation team.