CallClerk - Settings - DTMF Signaling Window

The CallClerk - Settings - DTMF Signaling window is used to set the options related to Dual-tone multi-frequency (DTMF) signaling.

DTMF signals are the sounds you hear when you press the buttons on your phone's dial pad.

There are many electronic devices and systems which react to DTMF signals, with some systems being able to tell on which side of the telephone call (the caller's side or the receiver's side) the DTMF signal was sent.

For example the DTMF signals, of 123, might be used to open a door in the lobby of an apartment building, but only if sent from the apartment owner's phone.

DTMF Signaling may be turned on for Familiar, Unfamiliar, or Blocked callers in the CallClerk - Settings - Control Panel window, additionally distinctive DTMF signaling can be set for a specific caller in the CallClerk - Directory Add/Edit window.

When DTMF Signaling is used, CallClerk will answer a the call, send a DTMF signal, and then hang up.

In this way, further to the example above, CallClerk can be set up (for example) to open an apartment lobby door based on a call from your cell phone number, or a group of people's cell phones if they were all to be identified as familiar callers.

The DTMF signals which may be used include: the numbers 0 thru 9, the letters A thru D, star, and pound ( “0123456789ABCD*#” ).

The CallClerk - Settings - Signaling window looks like this: