FRITZ!Box 7581 Service

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Number of telephony and DECT devices that can be used with the FRITZ!Box

You can use various telephony devices with the FRITZ!Box, for example telephones, fax machines, answering machines, or telephone systems (PBXs). How many devices can be used depends on the type of connection.

If you set up an additional FRITZ!Box as a Mesh Repeater, the number of possible devices increases accordingly.

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

1 DECT devices

The following DECT devices can be registered with the FRITZ!Box at the same time:

six cordless telephones / DECT door intercom systems (total)
six DECT repeaters, for example FRITZ!DECT Repeater 100
twelve radiator controls, for example FRITZ!DECT 300
ten outlet switches, for example FRITZ!DECT 210
ten FRITZ!DECT smart buttons
ten smart home sensors from other manufacturers

2 IP telephones and IP door intercom systems

You can register a maximum of ten IP telephones (for example FRITZ!App Fon) or IP door intercom systems with the FRITZ!Box.

3 Analog devices

The FRITZ!Box has four sockets for analog devices; you can use two of them, for example for a telephone, fax machine, and/or door intercom system. One "FON 1" socket and one "FON 2" socket must stay free (not allocated):

"FON 1" and "FON 2" for devices with an RJ11 plug
"FON 1" and "FON 2" for devices with a TAE plug

4 Integrated answering machine and fax function

You can use the FRITZ!Box as a fax and answering machine, without having to connect any additional devices. The FRITZ!Box can be used to send and receive faxes and you can configure up to five different answering machines.

FRITZ!Box 7581 Service - Knowledge Base

Number of telephony and DECT devices that can be used with the FRITZ!Box

1 DECT devices

2 IP telephones and IP door intercom systems

3 Analog devices

4 Integrated answering machine and fax function

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