The system ignores certain actions initiated by the monitoring party, i.e., digit events.

The system responds by displaying the NOT POSSIBLE message for five seconds when the monitoring party presses a key which signals a flash (either the FLASH_KEY or a feature key that produces the same result) in an attempt to activate a feature. The call state remains intact.

An 'ON HOOK' by the MONITORING PARTY when in the 'MONITORING_TALK' call state causes an immediate breakdown of the whisper monitor connection and deactivation of the Whisper Announcement feature. The target and its partner are returned to the call states that existed prior to the whisper monitor connection.

The MONITORING PARTY is not able to receive incoming calls or to answer any call. The MONITORING PARTY is not in an "IDLE" call state.