Dear sir I build a daughter card to interface the FXO module with blackfin537 stamp board, but unfortunately I can`t get Dial tone or any other signalling via fxo port.however the fxo module has been detected on the board. my daughter card work with clock= 2.048MHZ, and i configure asterisk with USA signalling.I suspect that the frequency of 2.048MHZ (form E1 TDM frame ) is not suitable for USA signalling as USA work with standard T1 TDM . am I right or not,are that could make a problem. Thanks for your help.
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