Controlling the B-Channels• 9-10 •
The H.110 Basic Rate ISDN Board
9.4.8 An Example of Detecting DTMF Digits
Once a connection has been established, there may be a need to detect
DTMF digits. An example is when the call is not an end to end ISDN call,
and there is a need for the far end to signal the near end. In this example,
DTMF detection is turned on, a string of digits is detected and then the
connection is reestablished. Note that no “D” commands are issued
because the call state has not changed.
commands responses description
CL06 listen for DTMF command with dial tone
SX06 DTMF detection enabled
ST061 the digit “1” is detected, dial tone
removed
ST062 the digit “2” is detected
ST063 the digit “3” is detected
CC0601020304 reestablishment of connection
SC06 connection confirmation
9.5 Voice Resources
The H.110 BRI Board is equipped with 64 channels of voice record and 64
channels of voice playback capability. The operation of these channels is
beyond the scope of this document. For further information consult the
appropriate driver and library manuals for the operating system being used.
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