HOW CLI displays number from analog phone line

[quris_terris]

plz tell me how CLI display number from analog phone line . when we dial a number how our number goes to other party CLI. plz provide me a CLI circuit which collects information (calling party phone number) from analog telephone line.

 

[latecomer]

Hello,
The CLI is generated from your local telephone exchange. It is transmitted on analog lines in DTMF or FSK format. The Decoder chip in the CLI device receives the signals and displays them on the LCD display.

When you make a call to another telephone , your telephone exchange transmits your telephone number to the telephone exchange where the other telephone is located. That exchange transmits the CLI to that telephone on analog lines. The CLI data is transmitted either before the RING or in between the RINGS (depending on the type of exchange)

CLI circuit for DTMF type is pretty simple and it is designed around CMD8870 or HT9170 IC(DTMF decoder IC).
For FSK type, it is a little complex as the data received is in serial mode.

You can find many CLI circuits on the net. Just "google" them.