Terry ,
It nice that if you cannot help some one don't try to discourage him..

Let see if you know the answer of how to make a circuit to detect off-hook of telephone set only one telephone set and detect the pulse dailing...iam not saying this just to make all of you emotional so that you answer this ..but just to say that its really difficult..

you don't find book on telephony related to controller and if you find one that is too difficult to read...

Simple:-

how to make a software for detecting pulse digit dialing from 100 to 110 that's it...and how to connect the telephone..?

iam pretty sure that it is not as easy as you people think..

i have tried about 9 ways of doing this but none worked out , i burned atleast 4 controller in 1 weak , its not because i don't know the logic its just that iam a hobbist trying to do work like engineers do.