Hallo Waqar,

have you already had a look at Michael's excellent reply in 'RE: Software Filter'? He has spent lot of time and energy to give you a detailed answer on your question.

I you have read it, did you already thanked him? Is it tradition in Pakistan to say 'Thank You', when you get help from someone? Especially when this 'someone' is such a nice and professional guy like Michael?

And, we are now discussing 'detection of pulse dialing'. Nothing else.

Bye,
Kai