Denice Hall-CloudCopper ContributorNov 14, 2017Skype for Business Endpoint We are new to Office 365 and Skype for Business and are still struggling with opening all of the necessary ports on our firewall. Our firewall needs to use URLs rather than IP Addresses. We have sev...Show More
AlexanderHolmesetMVPNov 14, 2017https://support.office.com/en-us/article/Office-365-URLs-and-IP-address-ranges-8548a211-3fe7-47cb-abb1-355ea5aa88a2 here you go
