Now this looks like a answer

http://www.mathtools.net/Applications/DSP/Design_tools/

look for

AltoCom, Inc.

I'm gonna get it

>Hi all
>I try to figure how i can use my Modem to answer the phone play a message to the caller and intercep the value of the key the presse on the phone and save these value on a table...
>
>let me explain what i try to build..
>I want to let a user call my app punch is password if the password is good
>he can now enter is working time ..
>
>Any suggestion