Can't hang up or unhold a call using headset buttons after hanging up a second call

Applies to: Skype for Business 2016

Symptoms


In Microsoft Skype for Business 2016, consider the following scenario:
  • You have a USB headset which has a feature used to hang up, hold, or unhold Skype for Business calls.
  • You have two calls in progress, and you use your headset to hang up one call.
In this situation, you can't hang up or unhold the remaining call by using the headset.

Cause


After you hang up the second call, the headset doesn't send proper USB events indicating an additional call is still on hold.

Resolution


To fix this issue, install the September 1, 2020, update (KB4484501) for Microsoft Skype for Business 2016.