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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; with some providers, the telephone numbers are even configured automatically when your internet connection is configured. Telephone numbers with the same account information can also be grouped and managed together.

In addition to this standard configuration, the FRITZ!Box also allows you to configure SIP trunks and SIP trunk lines.

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.

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

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.
  4. Select your country from the drop-down list under "Location Information". If your country is not listed, select "Other country".
  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 and on the FRITZ!Box, confirm that the procedure may be executed, if you are asked to do so.

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:

  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. Enter all of the extension numbers (trunk number plus extension) you want to assign the telephony devices connected to the FRITZ!Box. If you need additional fields, click "Other Telephone Numbers".
  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 "OK" 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". If the option is not displayed, enable the Advanced View first. Whether you must enable the option depends on the provider. Try both settings or ask your provider.
  5. Click "OK" 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 "OK" to save the settings.



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