Skype4B Latest architecture poster available to download and understand requirements of Skype for Business 2015 servers and clients under different levels of service complexity. When you planning the deployment its easy to you to understand using workload diagrams.. Not only that it will be very easy to face troubleshoots if you understand in-depth of the workloads and how it works Download from here IM and Presence diagram, AV MCU Diagram ( Interesting Part ) Certificate requirement , CMS DNS Records should be following, Enterprise Voice Enjoy !!!