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Thanks for the information Angus, could you share the low pass filter circuit that you use before...my project is only to send DTMF (just Dialing)

my email is [email protected].

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Thanks Art for the Tip
I will try at 20MHz.....by the way , I like your website......

Thanks BobK
I have read the website from your first reply which helps me a lot to undertands how telephones work, I was trying to avoid the transformer because I don't have one on hand rigth now,...

tried this circuit which didn't work too...

Hi
I'm really new with DTMF staff and I have been trying to dial a number throught the telephone line, I had tried differents circuits but not one has work succesfully, with the one attached...