Hi Babak,

You can set the debug level high to check which tone and duration is being detected. From Audacity the frequency is 425 Hz so 49 descriptor reorder should be detected. You might need to fine tune the duration looking at the debug messages.

Hope this helps.
Kalyani

On Thu, Apr 7, 2016 at 1:26 PM, Babak Yakhchali <babak.freeswitch@gmail.com> wrote:
Hi
I want to detect the tone that is attached to this email with spandsp. what descriptor should I use. I'm trying 49 but it is not working.
thanks

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