Rainbow presence : state "invisible"

Hi,

When setting state "invisible" in Rainbow, I expect to hide my state to others.

The goal is to be not disturbed.

If I make a Rainbow call (WebRTC), state "invisible" is seen by others = OK.

If I'm associated to an OXE phone set, when phone set is busy, state reported in Rainbow is "Busy".

I should expect to keep my invisible state.

Voluntary or not ?

Not correct in my opinion !