Detect Ring Back Tone and Busy tone

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Aug 20, 2008
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Hi
I use A400p and can dial-out and get incoming call.
Now I have some customers and i want to develope an application that it'll have had ability to dial customers sequential and played special wave file .
But i don't understand whether or not i can detect "busy tone" and "ring back tone" .
I have an experience with Dialogic board and Call analyze . I have a question : Where must i check this signal in my Sofphone or Elastix has the ability to does this task ?

Thank you
 

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