How caller ID circuitry works?

can you give me the schematic diagram, block diagram or circuitry of the caller ID, the one that is separated from the handset

Answer:
Caller ID is not expressed in circuitry. It is a logical data processing function of the central office switch. The little Caller ID box contains nothing but a microprocessor slice, a program ROM, and a little bit of RAM, an LCD display driver chip, and the display.

If you have Caller ID enabled, the CO switch sends a message packet containing the caller's information, which is picked up by the microprocessor and displayed.

For more information about how CO switches process information, try an internet search on "CO Switch Function." The amount of information you find may be limited in this case, because the manufacturers and telecomm companies do not want it to be widely known, for security reasons.

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