When you receive a public switched telephone network (PSTN) call in Microsoft Skype for Business 2016, the call control window flashes.
This issue occurs because PSTN conversation calls don't have a conversation ID to generate a unique handle value for each conversation window.
ID članka: 3207140 - posljednja izmjena: 6. pro 2016. - verzija: 1
Skype for Business 2016