iam using At89c52 , MT8816 , Crsytal of 11.05KOH ..

24 Volts Dc for Telephone Set..On Hook
5 Volts when Off-Hook.

- 5volts and 5 Volts DC.

For ringing 50 Volts Ac.

Each SLIC has :-

Comparator to sent Off Hook Signal..
5 Volts Relay,
switching tarnsistor etc...

Come guys there is a code for Frequency Counter is the code which i make with all you people assist can help the future people ....as really there are codes for Frequency Counter but no Pulse Dialing Code...althought the code link mentioned by Ijaz is also there but really it has no link with telephone Dialing..

So please some example or some hint to start like which comand is helpful in this case or like time relation with pulses or counting or incrementing a register what should be done..