FRITZ!Box 7390 Service - Knowledge Base

FRITZ!Box 7390 Service
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Using the FRITZ!Box on an ISDN point-to-point line

ISDN point-to-point lines are used in professional environments in conjunction with large PBXs. ISDN point-to-multipoint lines are common in the private sector and in small offices. The FRITZ!Box is designed for use with point-to-multipoint lines.

If you set up the FRITZ!Box as described here, you can then also use your FRITZ!Box and ISDN PBX on a point-to-point line to conduct calls over your landline and the Internet. Since this is not a guaranteed product function, AVM does not guarantee trouble-free operation of the FRITZ!Box on an ISDN point-to-point line.

Important:Some of the settings described here are only displayed if the advanced view is enabled in the user interface. The configuration procedure and notes on functions given in this guide refer to the latest FRITZ!OS

1 Connecting the FRITZ!Box to the ISDN point-to-point line and DSL

  1. Connect the longer gray end of the DSL/telephone (Y cable) included with delivery to the "DSL/TEL" socket on the FRITZ!Box.
  2. Connect the black end of the Y-shaped cable to the ISDN point-to-point line.
  3. Connect the gray end of the Y-shaped cable to the DSL line.

2 Removing all devices and cables from the "FON S0" port

  • Remove all devices and cables from the "FON S0" port on the FRITZ!Box.
    • Do not connect the ISDN PBX to the FRITZ!Box yet.

3 Enabling support for the ISDN point-to-point line in the FRITZ!Box

Preparations

  • Configure the devices so that you can dial special characters (such as * and #) or send keypad sequences (sequences of symbols and digits, such as *121#) with them.

    Note:Many Gigaset telephones can be configured as follows: Select "Operation at a PBX" from the telephone's menu, then select "Dialing options" and enable the option "Dial * and #".

Enabling support for the ISDN point-to-point line

  1. Pick up the handset of a telephone connected to the FRITZ!Box.
  2. Dial #965*2*#91** and then hang up again.
    • This enables the function "point-to-point line with fixed TEI 0".

      Note:If necessary, you can dial #965*3*#91** to switch the FRITZ!Box to "point-to-multipoint line with dynamic TEI".

4 Connecting an ISDN PBX

  • Connect the PBX to the "FON S0" port on your FRITZ!Box.

    Important:With the "point-to-point" operating mode, you can only connect one ISDN terminal device to the "FON S0" port on the FRITZ!Box. Therefore, do not connect any other devices to the "FON S0" port.

5 Restarting the FRITZ!Box

When you restart the FRITZ!Box, it recognizes that a PBX designed for use on a point-to-point line is connected to the "FON S0" port on your FRITZ!Box. After the restart, the FRITZ!Box automatically switches the "FON S0" port to the "point-to-point" operating mode:

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Backup" in the "System" menu.
  3. Click on the "Restart" tab.
  4. Click the "Restart" button.

6 Disabling the energy-saving mode in the FRITZ!Box

The FRITZ!Box is equipped with a number of energy-saving mechanisms. For example, when idle, the internal S0 bus of the FRITZ!Box terminates communication between it and the ISDN device.

Some ISDN devices have problems with this function. Therefore, disable this function in the FRITZ!Box:

Preparations

  • Configure the devices so that you can dial special characters (such as * and #) or send keypad sequences (sequences of symbols and digits, such as *121#) with them.

    Note:Many Gigaset telephones can be configured as follows: Select "Operation at a PBX" from the telephone's menu, then select "Dialing options" and enable the option "Dial * and #".

Disabling the energy-saving mode

  1. Enter #966*1* on your telephone and press the call key (lift the receiver).
  2. Hang up again after about 3 seconds.

    Note:You can re-enable this function by entering #966*0*.

7 Configuring a trunk number and extensions in the FRITZ!Box

Enabling the landline settings

  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. Enable the option "Landline network enabled".
  5. Click "Apply" to save your settings.

Configuring a trunk number and extensions

  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 "Landline number" and click "Next".
  5. Enable the option "multiple landline numbers (ISDN line)" and click "Next".

    Important:You will only be asked to select the type of landline (analog or ISDN line) when you configure the first landline number. If you would like to change the type of landline later, you must delete all of the landline numbers you entered first.

  6. In the field for the first ISDN number, enter the trunk number followed directly by the extension for the switchboard (without spaces).
  7. In the field for the second ISDN number, enter the trunk number followed directly by the longest internal extension (without spaces).
  8. Do not enter any additional telephone numbers if you want to connect all of your telephony devices to your ISDN PBX.
    • If you also use other telephony interfaces on the FRITZ!Box (for example "FON 1" and "FON 2"), enter all of the extension numbers including the trunk number that you want to assign to devices connected to them. You can only enter and use up to ten extension numbers for these telephony devices; your ISDN PBX allows you to use more than ten extensions.
  9. Click "Next".

8 Configuring Internet telephone numbers in FRITZ!Box

Suitable Internet telephone numbers

You can use Internet telephone numbers with the "FON S0" port if they correspond to the final digits of a trunk number with an extension (for example, 567 corresponds to the final digits of 4567) and/or they are not used by the Internet telephony provider for registration. Other Internet telephone numbers are not signaled to the "FON S0" port if it is configured as a point-to-point line. You can use any Internet telephone number for the other FRITZ!Box telephony interfaces (for example "FON 1" and "FON ").

NoteIf an Internet telephone number is used for registration, then the telephone number must be transmitted to the Internet telephony provider's SIP server during registration. Contact your Internet telephony provider to find out whether that is the case for a specific Internet telephone number.

Configuring Internet telephone numbers

  • Enter your Internet telephone numbers in the FRITZ!Box. However, please note the following:
    • If you would like to use and Internet telephone number for the "FON S0" port that is not contained in a trunk number with an extension, configure the Internet telephone number in the FRITZ!Box as follows:
      1. "Other provider" must be selected from the "Telephony provider" drop-down list.
      2. Instead of entering the Internet telephone number in the fields "Telephone Number for Registration" and "Internal Telephone Number in the FRITZ!Box", enter the trunk number followed directly by an extension (without spaces).

        Note:This configuration is possible because the telephone number is not used to login with the Internet telephony provider, and it is required for the Internet telephone number to be signaled at the "FON S0" port.

      3. Enter the rest of the login data (for example user name, password, registrar) that you received from your Internet telephony provider.

9 Configuring the extensions of your PBX

Now you can assign all of the telephone numbers you entered in the FRITZ!Box to the extensions of your PBX. If you would like to use an Internet telephone number to make a call from an extension, enter the number in the extension exactly the way it is displayed in the FRITZ!Box user interface under "Telephony > Telephone Numbers".

You can also use all of the extension numbers of the point-to-point line with the extensions of your PBX, even if you did not enter the extension numbers in the FRITZ!Box (see section "Configuring a trunk number and extensions in the FRITZ!Box").