Connect prerequisites: Skype for Business
The prerequisites discussed here do not apply to Cisco Unified Communications Manager for IM and Presence environments, when Jabber is selected during the BEMS server installation for use with the Connect service.
If your environment uses multiple Skype for Business on-premises servers using trusted application mode or non-trusted application mode, have the Skype for Business servers load balanced with a load balance server. For more information, visit Microsoft resource Load balancing requirements for Skype for Business.