This function enables the detection of DTMF digits. This function only works when the IP Office Wave driver is involved in the call and the user is a WAV user. Detection is done by analyzing media samples in the WAV driver. When a DTMF tone is detected a line_Monitordigits message is sent to the application. dwDigitModes can belineDigitMode_DTMF and lineDigitMode_DTMFEnd. Call lineMonitorDigits with a dwDigitMode of zero to cancel DTMF digit detection.

LONG
WINAPI
lineMonitorDigits(
HCALL hCall, 
DWORD dwDigitModes 
);