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DTMF
Programming
The programming interface using DTMF from a telephone on the Input port provides a limited set of options.
It is very useful for setting the initial IP address so that further programming can be done over the IP network.
Entering DTMF Program Mode
The V-9972 monitors the telephony audio port for the DTMF digits “**” + Pass-code + “*” at any time during a paging
event. Using the default values, this would be **9972*. If the V-9972 detects that sequence, the V-9972 enters into
DTMF Program Mode. The outbound page interface will be disconnected and returned to idle condition.
DTMF Program Mode Acknowledgement
When entering DTMF Program Mode, the V-9972 responds to the user with an acknowledgement tone on the
telephony input. The V-9972 shall then monitor the telephony input for DTMF parameter index combinations per
DTMF Programming Options in the table shown below.
DTMF Programming Timeout
When DTMF programming mode is entered, the absolute timeout time shall be set for the duration of the call to10
minutes, and the silence timeout disabled. If this absolute timeout is reached before the user terminates programming
by hanging up, the V-9972 shall issue a reorder tone to the user and then hang up the telephony connection.
DTMF Program Menu
The DTMF Menu consists of the user keying in two DTMF digits to select the item to be programmed (the parameter
index) and then a variable number of digits to perform the actual setting. To abort the current selection or to
terminate a variable length field, the user will key in a ‘#’. After entry of a successful DTMF parameter index, the
acknowledgement tone is transmitted and the V-9972 enters a state where the parameter value can be entered.
If the DTMF parameter index is invalid, the V-9972 returns a tone to indicate command rejection, and then waits for
the next menu item selection.
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