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Knowledge document #32

Configuring internet telephone numbers in FRITZ!Box

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.

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. If shown, enable the option "Internet telephone number" and click "Next".
  5. If a drop-down list with internet telephony providers is displayed, select your provider. If your provider is not listed, select "Other provider".

    Note:Whether the drop-down list is available and which providers are displayed depends on the country you selected in the FRITZ!Box.

  6. 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.
  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 the option "Insert area code for outgoing calls" is shown, you can enable it. The area code is then automatically added when you make calls to numbers that do not begin with "0", so you do not have to enter it.
  10. 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. Enable the option "Internet telephone number" and click "Next".
  5. Select your SIP trunk provider from the drop-down list. If your provider is not listed, select "SIP trunking with various telephone numbers".
  6. 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".
  7. Enter the account information (for example username, password, registrar) in the corresponding fields. This information is supplied by your provider.
  8. 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.
  9. 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.
  10. 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.
  11. 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. Enable the option "Internet telephone number" and click "Next".
  5. Select "SIP DDI line" from the drop-down list.
  6. Enter the trunk number of your SIP trunk line.
  7. Enter the switchboard extension.
  8. Select the length of the longest internal extension number from the drop-down list.
  9. 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.
  10. Enter the account information (for example username, password, registrar) in the corresponding fields. This information is supplied by your provider.
  11. 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.
  12. 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.
  13. 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.
  14. Click "Next" and follow the wizard's instructions.

3 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.

4 Entering the VLAN ID for internet telephony

The following step is only necessary if your internet telephony provider requires a VLAN ID for internet telephony:

  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. Click on "Changing the Settings" in the "Telephony Connection" section. If the section is not displayed, enable the Advanced View first.
  5. Enable the option "VLAN required for internet telephony".
  6. Enter the parameters required by your internet telephony provider in the "VLAN ID" and "PBit" fields.
  7. Click "Apply" to save the settings.

5 Enabling internet telephony via the mobile network

The following step is only necessary if the FRITZ!Box is configured for internet access via the mobile network, and you also want to make internet calls when the FRITZ!Box establishes the internet connection over the mobile network:

ATTENTION!Some mobile network providers stipulate in their contracts that you cannot use your mobile internet connection for internet telephony. Ask your provider about the terms and conditions!

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Mobile Network" ("Mobile Communications") in the "Internet" menu.
  3. Enable the option "Use internet telephony via the mobile internet connection".
  4. Click "Apply" to save the settings.



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