I'm tryin to use the caller identification function in a project. For this i need to read the caller id of the incoming call using a microcontroller. So i need the encoding technique and the code word for the caller id used in india.... could some1 help me out???
Welcome to Broadbandforum.in.
Try Google/Yahoo search engines. I just tried the term "DTMF coder ", Duel Tone Multi Frequency (DTMF Electronic Circuits
You can choose the link you need.
Another coding system is FSK.
Nowadays telephone sets come for dual mode operation.( DTMF enabled and FSK enabled). Hope you can take off now independently.
hmm thnx for tht, have read n searched a lot regardin dtmf n fsk encoding.... afaik, bsnl sends the caller id encoded using dtmf signal... but how its sent over the line, i mean the line voltages of the signals, and their duration etc. is wht i aint able to find... i'd also wanted to kno how the word is encoded, as in if any start bits or nething are transmitted. the whole project is to be implemented using a microcontroller/peripheral electronics. thts why i need these details.