But for Pulse Dialing can i use the same off-hook detection path to sent Pulses of dialing to controller using the theory that if "1" is pressed 1 pulse goes to controller if "2" is pressed 2 pulses...and if 0 is pressed then 10 pulses...

Your concept is true. Off hook signal is used for pulse dial decoding. But before applying this signal to the controller, be sure it is at TTL level and no noise/spikes. You may use a schmitt trigger gate for this purpose.

Dial pulses have certain timing requirements as well. Mark/Space ratio varies from country to country. Two standards are very common 60/40 msec and 70/30 msec.