12.4.5. Restrictions 
The feature can be used in boss/secretary arrangements for a discreet
call announce. In this case the feature must be activated by entering
extension of target, therefore ACTTARGET=EXT must be set in AMO ACDSD,
TYPE=SYS.
It is recommended that the target shouldn't be an ANATE, because
in this case there is a noticeable hardware echo which allows the partner
to softly hear the supervisor whispering.