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How to Connect Telephones and Other Terminal Devices to a FRITZ!Box 7490

This guide will demonstrate how to connect telephones, answering machines, fax machines and telephone systems (PBXs) to your FRITZ!Box.

Analog Telephone or Terminal Device

  • First, connect your terminal device to the FON 1 or FON 2 ports.

Analog or terminal device

  • Now, configure the new terminal device in the FRITZ!Box. If you are unsure how to do this, read: How to Configure Telephones and Other Terminal Devices further in this guide.

How to Connect ISDN Telephones or ISDN Terminal Devices to a FRITZ!Box

Note: – ISDN terminal devices are required for this section. Such ISDN terminals must support operation on an ISDN point-to multipoint line.

How to Connect ISDN Telephones

  • First, you need to connect your ISDN telephone to the FRITZ!Box via the FON S0 port.

ISDN Telephone

  • Now, configure the ISDN in the FRITZ!Box. Read: How to Configure Telephones and Other Terminal Devices further in this guide for more information.

How to Connect Multiple ISDN Telephones

S0 bus cabling will allow you to connect a maximum of eight ISDN telephones to the FRITZ!Box. However, keep in mind these points:

  • The FRITZ!Box will have terminators installed, so it must be positioned on an end of the S0 bus cabling.
  • The FRITZ!Box can only supply one ISDN telephone with electrical power. This means that all other ISDN telephones will need their own power supply.


IP Telephones

IP telephones are generally used for making calls over the Internet and other computer networks, instead of over a landline. However, a FRITZ!Box can be both connected to a landline and used as an IP telephone. This will allow the FRITZ!Box to make calls over the Internet and the landline network as well.

How to Connect Your Telephone via LAN or Wireless LAN (WLAN)

  • You can connect the IP telephone to the FRITZ!Box router either over wireless LAN or by using a LAN cable. If you connect via wireless LAN, you will be asked to enter the network key, which can be located on the underside of the FRITZ!Box.
  • Now, you need to configure the IP telephone in the FRITZ!Box user interface. Read: How to Configure Telephones and Other Terminal Devices for more information.


How to Configure Telephones and Other Terminal Devices

All your telephones and any other terminal devices are configurable in the FRITZ!Box user interface. However, for each terminal device added into the FRITZ!Box, it must have defined:

  • First, the name of the device must be defined. This will later be displayed in the call list of the FRITZ!Box. i.e:

Call List

  • Next, the telephone number of your terminal device must be defined. This will then be used for outgoing calls to the public telephone network.
  • Finally, you must define the numbers for incoming calls. These could be specific settings for the terminal device, such as ringing for every call, pick up only, or only for calls to previously defined phone numbers.

How to Configure

  • First, access the FRITZ!Box user interface. To do this, you must directly connect your FRITZ!Box to your computer via Ethernet cable. Make sure the power supply and any other ports are still connected. Type: into any web browser. You will then be directed to the FRITZ!Box user interface. You will need to enter your username and password, which will be have supplied by Wi-Manx.
  • Now, in the FRITZ!Box user interface, select the “Telephony” tab, and then find the “Telephony Devices” menu.

Telphony - Devices

Telephony Devices

  • Please select “Configure New Device”. You can change the settings of an already registered device in this same location, simply click the button:Edit  to edit entries.

Cnfigure new

  • Now follow the instructions and steps provided. You will first be asked what type of device you are connecting. Enter the correct information and a set up wizard will guide you through the process.


If you have found this guide unhelpful and are still experiencing difficulties with your FRITZ!Box, please contact Wi-Manx support on 641188.