I have a running Asterisk IVR system that is build with DTMF tones detection. It is used for an interactive gaming purpose. Recently I have been exploring on how can I utilize Asterisk to detect a blowing tone from the user. When a user dials in, they will be prompted to blow into the microphone of their phone.
If possible, depending on the dB of the blow tone, the system should respond with a different menu. If not, just a simple low pass filter to detect if a blowing tone exist will be good enough.
Any pointers will be great as I am quite a newbie to Asterisk and I have been using Perl AGI in most of my programs.