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c#tapi

TAPI, C#: Detecting key presses on a phones keypad

I'm attempting to set up a system where I phone a number, and then to confirm it isn't an answering machine I want the recipient to press a phone key to forward the call. The trouble is I'm struggling to find the event that gets raised for phone key presses.

I imagine it is a tone event but nothing seems to be raising.

I could also do with knowing how to detect what key is pressed as well.

Thanks, Ryan

Solution

  • These are called DTMF tones, TAPI can detect and report them via the ITDigitDetectionEvent interface.

    You need to setup the appropriate event filter and tell ITLegacyCallMediaControl::DetectDigits that you are looking for DTMF.