How does Caller ID work?

Question

How does Caller ID work?

Answer 1

When someone calls the call goes through a series of computers. One of the computers jobs is to send the caller ID data to your Caller ID box or Phone with Caller ID a message encoded in 1's and 0's which is assembled as your name and phone number information. This process is very similar to the way data is sent over the internet from modem to modem.

Answer 2

Caller ID is really what your phone is registered under at your phone company. When the call goes through to your phone, the phone company sends information about that caller. This information is in a series of 1's and 0's. Your phone then decodes this information and displays it on the screen. If you were to block your name/number, the phone company would send the message, Blocked Call.

For more information go to:

http://electronics.howstuffworks.com/framed.htm?parent=question409.htm&url=http://www.ainslie.org.uk/callerid/cli_faq.htm

Answer 3

whenever someone calls it tracks the number in which it is calling from and shows it to you on the screen