Telephone instrument with electronic subscriber number store - has lock with contact preventing subscriber number erasure when in locked configuration

摘要

An energy store maintains the current supply even if the mains fail. The telephone instrument has a safety device with a locking element (16), with a locked and released positions. There is a lockable compartment (4) for the energy stores (6, 7) and a contact (19) operated by the locking device by which the erasing function of the subscriber number store is electrically locked when the locking element is in the locking position.