Currently, when a user places himself in DND mode, the status icon next to their name is changed and (I think) sounds are muted. But if someone sends the user a message, the IM window pops up to display the message on the users screen.
It would be nice if this didn't happen while in DND since doing so disturbs the user. Solution might be to indicate that the user has a message on the Jitsi icon and have a visual indicator in the buddy list next to any buddies who sent messages while the user was in DND. They could then click the buddy and view the messages.
Just a thought.
All the best,
Sent from my mobile device