FRITZ!Box 7330 Service - Knowledge Base

FRITZ!Box 7330 Service

Caller ID is not displayed for incoming calls

Caller ID is not displayed for incoming calls:

  • A telephone connected to the FRITZ!Box does not show the telephone number (caller ID) for incoming calls, or the number of the caller is only shown very briefly in the telephone's display.
  • A telephone does not display the number a caller dialed.

Important:Some of the settings described here are only displayed if the advanced view is enabled in the user interface. The configuration procedure and notes on functions given in this guide refer to the latest FRITZ!OS.

Simply proceed as described below. After each measure, check whether the issue persists.

1 Activating text information in the FRITZ!Box

The following steps are only necessary if you are using a FRITZ!Fon:

  1. Enter #960*2* on your telephone and press the call key (lift the receiver).
  2. Hang up again after about 3 seconds.

    Note:Enter #960*0* if you would like to disable the display of text information again.

2 Assigning display names in the FRITZ!Box

The following step is only necessary if the telephone displays caller IDs, but not the number dialed by the caller:

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone Numbers" in the "Telephony" menu.
  3. Click the button (Edit) for the relevant telephone number.
  4. Enter a name of your choice in the "Display name" field.

    Example:
    You could enter "VOIP_12345", "provider_12345, "office", "private" or "12345" as a display name for the Internet telephone number 12345.

  5. Click "OK" to save the settings.

3 Enabling the display of incoming caller ID in the FRITZ!Box

The following steps are only necessary if the telephone is connected to the analog extension "FON":

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephony Devices" in the "Telephony" menu.
  3. Click the button (Edit) for the relevant telephone.
  4. Click on the "Telephony Device Features" tab.
  5. Enable the options "Calling line identification presentation (CLIP)" and "Simple mode".
  6. Click "OK" to save the settings.

4 Checking the FRITZ!Box's call list

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Calls" in the "Telephony" menu.
  3. Check whether there any incoming calls (blue or red handset) that display the caller ID.
    • Caller ID is displayed:
      • The FRITZ!Box detects the numbers of the callers. The telephone does not display the numbers because it does not process the numbers being transmitted by the callers according to the general specifications. In this case, the telephone may display caller ID when it is connected directly to your line, but not when it is connected to your FRITZ!Box.

        Note:CLIP can be used with many cordless telephones, for example with all FRITZ!Fon models and many telephones from the Siemens Gigaset series. However, AVM cannot guarantee that CLIP will function with telephones from other manufacturers.

    • Caller ID is not displayed:
      • If caller ID is not displayed for incoming calls to an Internet telephone number, either your telephony provider has not enabled CLIP for your line or the caller did not transmit his caller ID.
      • If caller ID is not displayed when you receive calls to an analog landline number:
        • Proceed with the following section.

5 Checking the analog telephone line and devices

The following step is only necessary if the caller ID is not displayed when your analog landline number is called:

Checking whether the telephone and your line support CLIP

  1. Disconnect the FRITZ!Box from the DSL splitter's telephone socket.
  2. Connect an analog telephone to the DSL splitter's telephone socket.
  3. Check whether the telephone now displays the caller ID of the caller.
    • If the telephone does not display caller ID, either your telephony provider has not enabled CLIP for your line yet, your telephone does not support CLIP, or the caller did not transmit his caller ID.

Connecting all telephones and telephony devices to the FRITZ!Box

  • Connect all telephony devices (for example a telephone, fax) to the FRITZ!Box.

    Important:Connecting additional telephony devices or telephone sockets to the telephone jack can cause errors.

Testing whether another device is interfering with the FRITZ!Box

Interference from a device connected to the FRITZ!Box or the power mains may be reaching the FRITZ!Box. Therefore, perform the following test:

  1. Remove all devices and cables from the LAN ports and the USB port on the FRITZ!Box. If no devices are connected, connect a computer to a LAN port on the FRITZ!Box.
  2. Check whether the issue persists.
    • If the issue no longer occurs, then a device connected to the FRITZ!Box was transmitting interference to the FRITZ!Box or the computer now channels it off. Normally one of the following measures can eliminate the cause of the interference:
      • Use a power outlet strip to connect the FRITZ!Box and all other connected devices to the same electrical outlet.
      • Test different electrical outlets and power outlet strips.
      • Use UTP network cables to connect devices to the LAN ports on the FRITZ!Box. Unlike STP network cables (for example the network cable included with delivery), UTP network cables do not have a ground wire and cannot transmit interference to the FRITZ!Box. UTP network cables are available from specialized vendors.

        Important:If the issue occurs with a FRITZ!Powerline adapter, use the UTP network cable included with the FRITZ!Powerline adapter.

      • If a device connected to the USB port is transmitting interference to the FRITZ!Box, do not connect the USB device to the FRITZ!Box. Instead, connect it to a USB port on your computer.

Signal quality is too low

If your FRITZ!Box still does not display caller ID for incoming calls, the signal quality of your analog landline is too low.

In comparison to simple telephones, PBXs always place higher requirements on the signal quality of analog telephone lines. The FRITZ!Box clearly surpasses the limitation of the specifications to correctly identify and process incoming signals. However, in the case of extremely interference-prone lines, the FRITZ!Box's tolerance to errors can be slightly lower than that of an analog telephone connected directly to your line. Therefore, under some circumstances, a telephone that is connected directly to your line can evaluate the CLIP information even though the FRITZ!Box cannot. This is not due to an issue with the FRITZ!Box; instead, it is because the signal quality of the analog landline is too low.