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Knowledge document #32

Configuring internet telephone numbers in FRITZ!Box

You want to configure your telephone numbers in the FRITZ!Box to make phone calls over the Internet with them? ✔ It's easy with this guide.

You can configure up to 20 internet telephone numbers in the FRITZ!Box and make telephone calls over the internet (Voice over IP) with them. With most internet telephony providers, the FRITZ!Box automatically configures all of the provider-specific settings. Telephone numbers with the same account information can also be grouped and managed together.

If you received your FRITZ!Box from your cable provider, telephone numbers are often automatically configured in your FRITZ!Box when your internet connection is configured. With these providers, it may not be possible to change the settings for telephone numbers later or to add your own numbers. Refer to your provider for further information on editing and adding telephone numbers. If you purchased the FRITZ!Box in a store, configure the telephone numbers and telephony settings in the FRITZ!Box yourself.

If you are using your FRITZ!Box in Germany, use the guide that applies to your provider in Setting up the FRITZ!Box: Guides for different providers. If your cable provider is not listed there, proceed as described in this guide.

Requirements / Restrictions

  • It is not possible to configure a SIP trunk from Vodafone because the FRITZ!Box only supports the operating mode "Registered Mode". "Static Mode" is not supported.

1 Entering your location information

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone Numbers" in the "Telephony" menu.
  3. Click on the "Line Settings" tab. If the tab is not displayed, the correct location information is automatically entered by your provider.
  4. Select your country from the drop-down list under "Location Information".
  5. For the "Country code", enter the leading zeros in the first field and the country code in the second field (for example, enter "00" and "49" for Germany, see fig.).
  6. For the "Area code", enter the leading zero in the first field and the area code in the second field (for example enter "0" and "30" for Berlin, see fig.).

    Fig.: Entering the country code and area code (e.g. for Germany and Berlin)

  7. Click "Apply" to save the settings.

2 Configuring internet telephone numbers

Configuring an internet telephone number (standard)

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone Numbers" in the "Telephony" menu.
  3. Click the "New Telephone Number" button.
  4. Select your provider from the drop-down list. If your provider is not listed, select "Other provider" or "Anderer Kabelanbieter" if you want to configure a telephone number from a cable provider.
  5. Enter the internet number (telephone number) and the account information (for example username, password, registrar) in the corresponding fields. This information is supplied by your provider.
  6. If the option "Relay outgoing emergency calls without prefixes" is displayed, ask your provider whether calls to emergency numbers must be made with or without prefixes. Select the correct setting.
  7. If the option "Relay special rate numbers without prefixes" is displayed, ask your provider if calls to special rate numbers must be made with or without prefixes. Select the correct setting.
  8. If present, enable the option "Insert area code for outgoing calls". The area code is then automatically added when you make local calls over the internet, so you do not have to enter it.
  9. Click "Next" and follow the wizard's instructions.

Configuring an internet telephone number (SIP trunk)

If you ordered a SIP trunk from your provider, configure it as follows:

Important:SIP trunking from Deutsche Telekom, for example the package "Deutschland LAN SIP-Trunk Pooling", must be configured as described in this guide.

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone Numbers" in the "Telephony" menu.
  3. Click the "New Telephone Number" button.
  4. Select your SIP trunk provider from the drop-down list. If your provider is not listed, select "SIP trunking with various telephone numbers".
  5. Enter all telephone numbers of the SIP trunk provider that you want to assign to telephony devices connected to the FRITZ!Box. If you need additional fields, click "Other Telephone Numbers".
  6. Enter the account information (for example username, password, registrar) in the corresponding fields. This information is supplied by your provider.
  7. If the option "Relay outgoing emergency calls without prefixes" is displayed, ask your provider whether calls to emergency numbers must be made with or without prefixes. Select the correct setting.
  8. If the option "Relay special rate numbers without prefixes" is displayed, ask your provider if calls to special rate numbers must be made with or without prefixes. Select the correct setting.
  9. If present, enable the option "Insert area code for outgoing calls". The area code is then automatically added when you make local calls over the internet, so you do not have to enter it.
  10. Click "Next" and follow the wizard's instructions.

Configuring an internet telephone number (SIP trunk line)

If you ordered a SIP trunk line from your provider, configure it as follows:

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone Numbers" in the "Telephony" menu.
  3. Click the "New Telephone Number" button.
  4. Select "SIP DDI line" from the drop-down list.
  5. Enter the trunk number of your SIP trunk line.
  6. Enter the switchboard extension.
  7. Select the length of the longest internal extension number from the drop-down list.
  8. Do not enter any additional telephone numbers if you want to connect all of your telephony devices to an ISDN telephone system connected to the "FON S0" socket on the FRITZ!Box.
    • If you also use other telephony interfaces on the FRITZ!Box (for example "DECT" or the "FON 1" socket), enter all of the extension numbers (trunk number plus extension) you want to assign to them. A maximum of 20 extensions can be assigned to these interfaces, but your ISDN telephone system allows you to use more than 20 extensions.
  9. Enter the account information (for example username, password, registrar) in the corresponding fields. This information is supplied by your provider.
  10. If the option "Relay outgoing emergency calls without prefixes" is displayed, ask your provider whether calls to emergency numbers must be made with or without prefixes. Select the correct setting.
  11. If the option "Relay special rate numbers without prefixes" is displayed, ask your provider if calls to special rate numbers must be made with or without prefixes. Select the correct setting.
  12. If present, enable the option "Insert area code for outgoing calls". The area code is then automatically added when you make local calls over the internet, so you do not have to enter it.
  13. Click "Next" and follow the wizard's instructions.

3 Adjusting the login information for "Other provider"

If you selected "Other provider" in the configuration wizard and the telephone number does not get registered after setup, you may have to adjust the login information. If you select a preconfigured internet telephony provider, the FRITZ!Box configures the correct settings automatically:

Using own telephone number for registration

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone Numbers" in the "Telephony" menu.
  3. Click the (Edit) button for the respective internet telephone number.
  4. Enable or disable the option "Use telephone number for registration". Whether you must enable the option depends on the provider. Try both settings or ask your provider. There is no standard name for this parameter. Its technical acronym is "SIP URI".
  5. Click "Apply" to save the settings.

Using REGISTER-fetch

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone Numbers" in the "Telephony" menu.
  3. Click the (Edit) button for the respective internet telephone number.
  4. Enable or disable the option "Provider does not support REGISTER-fetch". Whether you must enable the option depends on the provider. Try both settings or ask your provider.
  5. Click "Apply" to save the settings.

4 Enabling registration via an internet connection

Some internet service providers establish a second internet connection for internet telephony; this connection can only use the internet service provider's numbers. Therefore, enable the following option if you are using an internet telephone number that is not from your internet service provider. The FRITZ!Box will then use the same connection you surf with for this telephone number:

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephone Numbers" in the "Telephony" menu.
  3. Click the (Edit) button for the respective internet telephone number.
  4. Enable the option "Always register via an internet connection".
  5. Click "Apply" to save the settings.



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