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detecting various telephone tones using DSP

Other Parts Discussed in Thread: OMAP-L138

Hi All,

            I am trying to make IP-PBX by using the OMAP-L138 .

can somebody guide me as what and how to proceed for detecting various telephone tones like dial tone, busy tone, call waiting tone, ring tone, CPE Alerting Signal (CAS), Fax Modem Calling tones (CNG,CT) etc by using DSP .

Regards

Nayan