C callerid New Member Jan 21, 2010 #1 is that anyone know Malaysia is use dtmf or fsk for the caller id services?
Mr RB Well-Known Member Jan 21, 2010 #2 Record it into your PC sound card and look at the waveform in a PC sound wave editor. Just be sure to use some zener diodes etc to protect from the 90v ringing signal which would damage your PC sound card.
Record it into your PC sound card and look at the waveform in a PC sound wave editor. Just be sure to use some zener diodes etc to protect from the 90v ringing signal which would damage your PC sound card.
K kchriste New Member Forum Supporter Jan 21, 2010 #4 You'll be able to hear the difference. DTMF CID makes the same sounds as when you dial your phone really fast. Last edited: Jan 21, 2010
You'll be able to hear the difference. DTMF CID makes the same sounds as when you dial your phone really fast.