Ok...I dont think there is a fix for this, but I wanted to see if anyone else had any suggestions/solutions for this. This seems like a design flaw with the Sidecars for the 500S. I have users who all have 508G Phones with 500S sidecars. The issue is DND. There is no way to differentiate between when a user is on a call and when they are DND. I have disabled MWI because if you use the Watch feature, it will show when they extension you are watching has a VM waiting to be answered. So the question becomes, how do you show the difference between when a user is away and when they are on a call. The light is the same for both.