Caller ID on EXT phone

You must have latest software to have Caller ID
You must have a Caller ID line card
Caller ID must be programmed on the phone to allow it
Caller ID signal from carrier is sent between 1st and 2nd call

FYI on the fax: Analog ports (ATA's) on the Norstar system do not show Caller ID, instead you would need to use a line share device that supports caller id such as the STICK.

Your fax machine does not actually have CALLER ID, it reads what the sending fax machine has programmed into it. If it was never entered in, you won't see it.

Fax machines don't have caller ID, they only read what the sender has programmed into their fax machine. Such as NAME & fax number

The FAX machine will print the Tel number that has been programmed in your machine. It does not print on the basis of the caller ID received. So i think if you remove the number programmed in your fax machine

Fax machines are designed for a dedicated phone line only.

No computer modems, no answering machines, credit card terminals, no digital phone lines, etc.

Usually, fax machines don't have caller ID capability.. If the sender's fax number appears on the faxes you receive, it's just that they have programmed it into their fax machine as a header.

Fax machines usually don't have Caller ID. If you see the phone number on received faxes its because the sender has programmed it into their fax machine.

Set the reception mode to Fax with answer machine TAD. Make sure its set for fax with answer machine.

To use caller Id, you will first have to subscribe to caller Id service from the phone company, unless the phone is part of an office system
Here is the link to the user instructions

http://www2.panasonic.com/consumer-electronics/support/Phones-Fax/Telephones/Expandable-Systems/model.KX-TG2740S.H

For people who have purchased cordless phone in usa and caller id is not working they should purchase fsk to dtmf converter at any local phone shop and caller id will start working.

Here is the article on various frequency used by various countries for caller id.

Hope this will help you out.

Detailed Product Description

There are 3 major caller ID specifications in the world: DTMF, ETSI FSK and Bellcore FSK. When users buy a foreign telephone devices(such as cordless phone, fax machine or computer telephony interface), may encounter the problems of non-match for caller ID standard. This will cause the device unable to display the caller ID. EX220 can solve this problem easily. This product can receive all 3 kinds of caller ID format, and convert to FSK(Bellcore or ETSI selectable) to match foreign telephone's standard.
EX220 has a rechargeable battery inside the device, during idle status, it gets power from the telephone line and recharge the battery, so no need to use or replace battery. Just plug one end to telephone line, and the other to the telephone device.
For example, if you live in Netherlands, Saudi or India, the caller ID standard is DTMF. You purchased a cordless caller ID phone from US(which uses Bellcore FSK standard), or from Germany(which uses ETSI FSK standard). You won't be able to use the caller ID feature. In this case, just get one EX220 and connect it between the telephone line and the cordless phone, your cordless caller ID phone will display the caller's number immediately.
Remark:
1. Telephone sets for UK and Japan standard are not applicable.
2. In some countries, users must subscribe to Telecom for caller ID service

Feature List
Caller ID Format Conversion --- Convert 3 kinds of caller ID(DTMF, Bellcore FSK or ETSI FSK) to ETSI FSK or Bellcore FSK(selectable)
Date/Time Stamp --- The DTMF caller ID doesn't content date/time stamp. User can set up clock of EX201, so each call will be sent with actual date and time stamp
Area Code Setting --- User can set up the area code, so the dial back feature can easily applied
Rechargeable battery powered by line --- Just connect to the telephone line, the built-in rechargeable battery can get power from the telephone line, no need any external battery nor power supply

News
Now, Multi-Line caller ID converter is available.