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MT8880 with commercial exchange not working??

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hameeds01

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Want to know y it is not working with commercial exchange ??
MT8880 as a decoder works well with both PBX (Private Branch exchange of 8 channels) & commercial exchange but when I used it as a dialer it worked well with PBX but didn’t work with commercial exchange. I m using audio transform (1:1) with capacitor to block the DC for isolation b/w the phone line & Mt8880 + its in Burst mode (it is generating DTMF tones but not dialing any # when i connected it with commercial exchange)
 

manish12

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1:1 may reduced the signal amplitude
 

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