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Issue with ti fax library

Hai,

Iam calling faxlib api functions in the following order in my dsp

At sending end

fmSendIn()

fiuTask()

fmTonedetect()

At receiving end

fiuReceiveIn()

1.Iam detecting ced tone  using my own algorithm and calling the fmsendIn,fiutask,fmtonedetect..Then what is the point in having siuToneDetectCtrl(Send a control command to the Tone Detector Unit.Currently we simply enable or disable the TDU) as it is triggered only after fmSendIn() is called? or do i need to call my tone detection algo after i get control command from siuToneDetectCtrl()?

2.What is the data and size of output of fiuReceiveIn() when I pass t.38 indicator packets from the network?Does fiuReceiveIn generates analog ced tone data for the t.38 ced indicator?or do i need to generate ced tone analog data to analog fax machine  when i recieve ced indicator packet?

3.Does fax library has support for 20ms interrupt?

4.Please correct me incase if I missed calling any other api's...

Thank you.