When you set your status to Do Not Disturb (DND) and then allow the computer to go idle the status changes to Away. When someone calls you in this Away state the call rings the PC. I would have thought the client would honor the DND status. If I test the same behavior using the web client I do not get the ring and only receive the missed call notification.

This seems like a bug or at a minimum an inconsistent behavior. Cannot find anything definitive that states what is expected.