FRITZ!Box 7340 Service - Knowledge Base

FRITZ!Box 7340 Service

Registering an IP telephone with the FRITZ!Box and setting it up

You can register a total of ten IP telephones with the FRITZ!Box. IP telephones can either be telephony devices (hardphone), a combination of an adapter and a regular telephone, or a software solution for your computer.

If the FRITZ!Box is connected to a landline, you can use the telephone to conduct calls over the Internet as well as from your landline after setting it up. In addition, you can register your telephone with the FRITZ!Box over the Internet or over a VPN connection. Besides making calls from home, you can then also make calls over the FRITZ!Box from anywhere.

Requirements / Restrictions

  • A maximum of ten IP telephones (including FRITZ!App Fon) can be registered.
  • The FRITZ!Box (IP address in the factory settings) should use an IP address from one of the following private IP address ranges:
    • -
    • -
    • -
  • The IP telephone must use an IP address from the FRITZ!Box's IP address range.

    Note:These requirements do not apply if you would like to register the telephone over a VPN connection between two FRITZ!Boxes.

  • You cannot register an IP telephone via the guest access.
  • You cannot use IP telephones for fax and data connections.
  • With IP telephones, you can conduct a maximum of two Internet calls at the same time.
  • Various FRITZ!Box functions cannot be used with IP telephones. For example, this is the case with call transfer, busy on busy, call-back on busy / no response, do not disturb function for individual numbers, the ability to control certain FRITZ!Box functions such as enabling or disabling wireless LAN, loading factory settings, or setting up call diversions.

Note:The configuration procedure and notes on functions given in this guide refer to the latest FRITZ!OS for your FRITZ!Box.

1 Configuring telephone numbers in the FRITZ!Box

First, configure all of your telephone numbers in the FRITZ!Box:

Configuring Internet telephone numbers

Configuring landline numbers

Configuring a mobile telephone number

2 Connecting the telephone to the FRITZ!Box

3 Configuring a telephone in the FRITZ!Box

  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 "Telephone (with or without answering machine)" and click "Next".
  5. Enable the option "LAN/WLAN (IP telephone)" and click "Next".
  6. Enter a password that is at least eight characters long and does not contain the user name.
  7. Click "Next".
  8. Select the number to be used by the telephone to make calls.
  9. Click "Continue".
  10. Select the telephone numbers that the telephone should react to.
  11. Click "Next" and then "Apply" to save the settings.

4 Entering registration information on the telephone

  • On your IP telephone, enter an Internet number with the following registration information:
    • SIP Registrar
      • If you only would like to use the telephone at home, enter or the IP address of the FRITZ!Box ( in the factory settings).

        Important:If the telephone failed to register or you are unable to make telephone calls, then you must enter the FRITZ!Box's IP address.

        • or, if you would also like to register the telephone with the FRITZ!Box over the Internet:
      • Enter the public IP address of the FRITZ!Box.

        Note:Most Internet service providers clear the Internet connection each day ("automatic disconnection") and assign the FRITZ!Box a different IP address when the connection is automatically re-established. The FRITZ!Box can be accessed over the Internet under its MyFRITZ! domain name at all times, even if its public IP address changes on a regular basis.

    • User name
      • Enter the user name as displayed in the FRITZ!Box user interface (for example 620).
    • Password
      • Enter the same password on the telephone that you entered in the FRITZ!Box user interface.
    • STUN server
      • Do not enter a STUN server.

Now you can use the telephone to make and receive calls using the telephone numbers you configured.

5 Configuring the telephone for registration from the Internet

If you want to use the telephone in your home network as well as over the Internet, then you must allow registration from the Internet:

ATTENTION!For security reasons, we suggest that you do not register IP telephones over the Internet; instead, they should only be registered over an encrypted VPN connection, for example over a VPN connection between two FRITZ!Boxes.

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephony Devices" in the "Telephony" menu.
  3. Click the button (Edit) for the respective telephone.
  4. Click on the "'Account Information" tab.
  5. Enable the option "Allow registration from the Internet".
  6. Click "OK" to save the settings.

6 Supported telephony functions

Normally you can use a telephone keypad to use a number of FRITZ!Box functions. However, this only works to a certain degree with IP telephones. The CLIP (display of Caller IDs) and CLIR (suppression of own Caller ID) functions can also be used when conducting calls with IP telephones. In addition, you can conduct internal telephone calls with other telephones, pick up calls from other telephones connected to the FRITZ!Box, and use quick-dial numbers as well as vanity codes from the FRITZ!Box telephone book.

Note:You can find the internal numbers of your telephony devices in the user interface under "Telephone Book > Internal Numbers".