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c#.netserial-portdtmf

Is it possible to detect DTMF tones using C#

I am trying to detect caller id information from telephone line. The caller-id information received is in DTMF tones (not FSK). How can I detect this DTMF tones ? Is Phone and Fax Modem capable of it ? The Phone and Fax Modem is capable of detecting FSK information, but not DTMF information.

Notes: I am using C# language and .NET as developing platform.

Solution

  • Yes, modems are capable of picking up DTMF. This Code Project article should have some clues on how to do it with TAPI:

    http://www.codeproject.com/KB/cpp/IVR.aspx

    For a more modern c#-ish project, look here:

    http://www.codeproject.com/KB/IP/devangpro.aspx