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Knowledge document #3513

Setting up an IP door intercom system in the FRITZ!Box

You can register an IP door intercom system with the FRITZ!Box and then talk with visitors and open the door when you are away from home if you route the door call to an external telephone number, for example. If the door intercom system has a camera, you can have the image from the door intercom system displayed on a FRITZ!Fon or FRITZ!App Fon.

Requirements / Restrictions

  • The camera for the door intercom system saves images in JPG/JPEG, PNG or GIF file format. Other file formats, for example MJPG/MJPEG, are not supported.
  • The camera makes the images available via HTTPS, HTTP, or FTP.
  • To show the images, a FRITZ!Fon with color display (FRITZ!Fon MT-F, C4, or newer) must be used.

Note:All instructions on configuration and settings given in this guide refer to the latest FRITZ!OS for the FRITZ!Box.

1 Connecting the door intercom system

  1. Either use Wi-Fi or a network cable to connect the door intercom system to the home network of the FRITZ!Box (not the guest network).

2 Setting up a door intercom system

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephony Devices" in the "Telephony" menu.
  3. Click the "Configure New Device" button.
  4. Enable the option "Door intercom system" and click "Next".
  5. Enable the option "LAN / Wi-Fi (IP door intercom system)" and click "Next".
  6. Enter a username that is at least eight characters long.
  7. Enter a password that is at least eight characters long and not the same as the username.
  8. Click "Next".
  9. When a bell button is pressed, the door intercom system calls the destination telephone number. In the field "Telephone Number of the Doorbell", enter the number assigned to the individual doorbells in the door intercom system. To open additional fields, click "Add Doorbell".

    Important:You may not use any internal telephone numbers of telephony devices connected to the FRITZ!Box for the bell buttons.

  10. From the drop-down list "Route Doorbells to", select the telephones or telephone number the doorbell should be routed to:

    Important:You can either select one or several internal numbers, or you can select an external telephone number. You cannot combine internal and external numbers.

    • If you want a specific telephone to ring, select the respective telephone.
    • If you want all of the connected telephones (broadcast call) to ring, select "All telephones".
    • If you want an external telephone number (for example another telephone line, mobile telephone) to ring, select "Telephone number" and enter the destination telephone number.
    • If you want several telephones connected to the FRITZ!Box (call group) to ring:
      1. Select the option "Call group".
      2. Select up to four telephones to be included in the call group.
      3. Click "OK".
  11. Click "Next" and then "Apply" to save the settings and on the FRITZ!Box, confirm that the procedure may be executed, if you are asked to do so.

3 Configuring the door intercom system

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephony Devices" in the "Telephony" menu.
  3. Click the (Edit) button for the door intercom system.
  4. From the drop-down list "Outgoing calls via", select the outgoing call number that should be used if you want to route the doorbell to a mobile telephone or an external line.
  5. If you want to use the "Open" function key on a FRITZ!Fon or with FRITZ!App Fon, enter the character sequence for the door opener.
  6. If the door intercom system is equipped with a camera or you use an IP camera in your home network, enter the complete web address with the image files in the "Live image" field. This URL must end with the file format of the image (for example image.jpg). The image is then displayed on the FRITZ!Fon and in FRITZ!App Fon when there is a call from the door intercom system. If you set up the "Calls" push service for the door intercom system, the FRITZ!Box sends you a push service mail including a camera image, either for all calls or only for the missed calls.
  7. Click "Apply" to save the settings.

4 Entering login information in the IP door intercom system

  1. In the door intercom system, configure an internet telephone number with the login information for the FRITZ!Box.
  2. Enter the username displayed in the FRITZ!Box user interface as the username for the telephone number.
  3. Enter the same password that you entered in the FRITZ!Box user interface.
  4. Enter or the IP address of the FRITZ!Box ( in the factory settings) as the SIP registrar.
  5. Do not enter a STUN server.

5 Notes on the live image

Live image on FRITZ!Fon

The FRITZ!Fon only rings three times if you set up the live image function so that video transmission is not disturbed. If you want it to ring longer, add another telephone without live image to the call group. This telephone will continue to signal the call from the door intercom system.

Use the "OK" key to switch between Standard View and zoom, and use the navigation keys to change the area of the image displayed in the zoomed-in view. The selected area is then used for the next call.

Live image in FRITZ!App Fon

If FRITZ!App Fon is running in the background in iOS, incoming calls are signaled by Apple's CallKit interface and can also be answered with it. However, CallKit does not display live images from a door intercom system.

Therefore, when you receive a call from the door intercom system, use the Fon button (symbol "FRITZ! lettering") from CallKit to open FRITZ!App Fon to display the live image in the app.

6 Setting up a door intercom system on the Mesh Repeater as well

If you set up an additional FRITZ!Box as a Mesh Repeater, you can forward the doorbell of the door intercom system to the Mesh Repeater. In addition, you can also see the live image and use the door opener on a FRITZ!Fon that is registered to the Mesh Repeater. In our guide Setting up a door intercom system on a Mesh Repeater you will find instructions on configuring it.