DND status and BLF

I need make next functionality for D50.
If user will change own status to DND, other phones must receive message and change light colour on BLF button.
How I can do it?


Device State and User Presence aren’t the same thing, they’re different. It sounds like you’re trying to do something that a D70, with its LCD-based Rapid Dial keys, is better-equipped to do.


Thank you for your answer.
I’ll try to put it differently
I need the following functionality: User1 must somehow find out that currently, the phones of other users is in DND status. Then I try to teach phones when the different phone is in status DND lamp must flashes amber. And then I’ll say to all users that “if lamp flashing amber it means that an another user pressed DND key”.
Do you have an idea how to implement it? Can you help me with this task?

Thank you!