If the system flag for the Monitoring with PIN is enabled, PIN activation must precede activation of Silent/Tone Monitoring.

The user can activate a PIN by using the service menu, by inserting the ID PIN chip card into the telephone device, or by employing the PIN Manual feature dialing procedure. If the entered PIN is valid, it will remain active for the time configured in its COPIN. If the system flag for the Monitoring Pin is not enabled, the Silent/Tone Monitoring feature is activated using the previous unsecure activation procedure.

Tone monitoring may be activated by pressing the MONTONE key configured on the digite device or by dialing the access code for Tone Monitoring.

Silent monitoring may be activated by pressing the ADDON key configured on the digite device or by dialing the access code for Silent Monitoring.

After a PIN has been entered, Silent/Tone Monitoring can be activated during the time the PIN is active. When a PIN is activated, the user hears dial tone and can then start the activation of Silent/Tone monitoring without first going on hook. In the case of "long" PIN or the ID card PIN, the user may go on hook and then activate monitoring at a later point in time as long the PIN is active.