问题
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.
回答1:
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
回答2:
You can try using a TAPI library and detecting DTMF is pretty basic stuff and most of them support it. Check out this library
来源：https://stackoverflow.com/questions/5951396/is-it-possible-to-detect-dtmf-tones-using-c-sharp