My approach for changing the dialing delays from 50 ms to 100 ms is because in Indonesia the DTMF signal have to send 100ms (i read it on manual book) and i use oscillocope to see DTMF signal from the telephone in redial mode, and the DTMF signal length is 100ms like i assumed.
And I have a problem if use speaker to dial phone the phone number is valid, but when i connected to telephone line the PBX doesn't responed. What is the problem ? Matching impedance ? the transformator isn't match ?
Anyone have the schematic that have been tried before, but it's working ? ?