I'm running a Legend Rel 7 in my home. When the ATL sets ring on incoming calls, it is the exact ring tone from the selected ring options. On the MLX sets, regardless of the ring selected, a single 'beep tone' is added at the end of the selected ring. Is this extra beep controlled by a setting? can it be turned off? Could not find it mentioned anywhere in the 3 volumes of legend manuals I have.