Hi Nicolas,
No transfers... only simple, normal, calls.
I've been able to reproduce the issue:
Let's suppose that both lines are idle/inactive. Then the user receives a call and he/she takes it...
IF during the call the other line rings and the user finishes his original call while that line is still ringing, the rectangle will stay orange, and it will stay that way until both lines become inactive again. BUT, if i press F5 the screen refreshes/relogins and the rectangle turns green immediately as it supposed to be.
On the other hand, IF the other line is inactive, the rectangle will turn green immediately after the user finishes the call.