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Prerequisites: 
Connect
 for 
Microsoft Lync Server
 and 
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 about load balancing requirements, visit https://docs.microsoft.com/en-us/skypeforbusiness/plan-your-deployment/network-requirements/load-balancing.
If you configure 
Connect
 for 
Microsoft Lync Server
 or 
Skype for Business
 with the 
Connect
 service configured as trusted by 
Skype for Business
, complete the following pre-requisites:
If you configure 
Connect
 for 
Skype for Business
 with the 
Connect
 service configured as non-trusted by 
Skype for Business
, complete the following pre-requisites: