Digit Monitoring
Digit monitoring monitors the call for digits. TAPI allows digits to be signaled according to
two methods (digit modes):
- Pulse. Digits are signaled as pulse or rotary sequences. For detection, these
pulses manifest themselves as nothing more than sequences of audible clicks. Valid
pulse digits are '0' through '9'.
- DTMF. Digits are signaled as DTMF (Dual Tone Multiple Frequency) tones. Valid DTMF
digits are '0' through '9', 'A'. 'B', 'C', 'D', '*', and '#'. Both the
beginning and the down edge of DTMF digits can be monitored.
An application can enable or disable digit monitoring on a specified call with
lineMonitorDigits. When digit monitoring is enabled, detected digits cause the application to
be notified with the
LINE_MONITORDIGITS message. This message provides the call handle on which the digit was
detected as well as the digit value and the digit mode. The scope of digit monitoring
is bound by the lifetime of the call. Digit monitoring on a call ends as soon
as the call
disconnects or goes
idle.
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