QoS

Are you using Citrix or any other 3rd party application that handles media (e.g. Call Recording / Contact Centre) with Skype for Business? You may find you’re not marking this traffic with the correct DSCP markings. You should configure QoS in the usual method using a Windows GPO. Mark Vale documents this process really well: https://blog.valeconsulting.co.uk/2015/09/07/skype-for-business-configuring-quality-of-service-qos/ Pat Richard has a really useful QoS Calculator here: https://www.ucunleashed.com/2821 “Why does it matter if I’m using Citrix or a call recording application like Verba?” Answer - They have their own executables and don’t use the standard SfB exe’s to send/receive media! ...

When configuring QoS (Quality of Service) in Microsoft Lync / Skype for Business you need to modify the media port ranges for various Services and Configuration using PowerShell. Pat Richard has made a brilliant QoS calculator for Lync/Skype for Business here http://www.ehloworld.com/2821. The calculator will provide you with the PowerShell commands required to configure QoS port ranges and the GPO’s. The calculator also gives you the commands to verify the Configuration (which this post is based on). ...