This command allows telephone numbers to be entered into non-volatile memory. These numbers can be used to either block or pass calls to the output phone jacks. See section on use of toggles "U,u" and "K,k". The on-board memory can store as many as thirty, phone numbers. Phone numbers entered into memory must be between 7 and 12 digits in length. Any attempt to enter a number less than 7 or more than 12 digits long will cause the unit to send back a question mark and the number will not be accepted by the memory. Ten digit numbers are common for the US and Canada. Less than and more than 10 digit numbers are common in other countries.

If you want to add “Private” and “Out-of-Area” and callers to the memory list, refer to the following:

This allows the programmer to set the internal clock on the unit. Since there is no battery backup on board, once power is removed from the unit, the internal clock resets to "00/00 00:00:00". This command may never have to be used, due to the following: On the first incoming call with Caller ID and a good checksum, the internal time clock will be set to the time sent in the Caller ID signal. On every call thereafter, the internal clock is reset to the Caller ID time. The format for time entry using the "Z" command is mm (month), dd (day), hh (hour), and mm (minute).

This command should be sent after the Caller ID signal and before the second ring. This way the call can be blocked (or passed) based on the Caller ID information. If toggle "B" is set, the first ring will be blocked. The application program determines whether the remaining rings should be blocked or passed. Please note: Normally, toggle "K" is set. This allows all calls to pass until a "W" is sent by the application (or an internal command is sent by the hardware memory). In a secure phone line application, the toggle "k" might be set in order to block all calls until the "W" command is sent (or the internal command is sent by the hardware memory).