Knowledge Base
AVM Content
- FRITZ!Box 7690
- FRITZ!Box 7590 AX
- FRITZ!Box 7590
- FRITZ!Box 7583 VDSL
- FRITZ!Box 7582
- FRITZ!Box 7581
- FRITZ!Box 7560
- FRITZ!Box 7530 AX
- FRITZ!Box 7530
- FRITZ!Box 7520
- FRITZ!Box 7510
- FRITZ!Box 7490
- FRITZ!Box 7430
- FRITZ!Box 7390
- FRITZ!Box 7360
- FRITZ!Box 6890 LTE
- FRITZ!Box 6850 5G
- FRITZ!Box 6850 LTE
Number of telephony 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 according to the number possible for that particular FRITZ!Box model.
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 for telephony can be registered with the FRITZ!Box at the same time:
- six cordless telephones / DECT headsets / DECT door intercom systems (total)
- six FRITZ!DECT Repeater 100
2 IP telephones and IP door intercom systems
You can register up to 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 ISDN devices
If you use the adapter included with delivery you can use both of the FRITZ!Box's "FON S0" sockets, without the adapter you can only use one socket. You can use an ISDN distributor or S0 bus cabling to connect up to eight devices to each socket at the same time, for example telephones or a telephone system. The FRITZ!Box can provide power to one ISDN device, but the other ISDN devices must use their own power supply.
You can use the following ISDN service indicators with devices connected to the "FON S0" socket:
- Voice (service indicator 1)
- Data (service indicator 2)
- Audio 3.1 (service indicator 4)
- Telephony (service indicator 16)
- Fax G2/G3 (service indicator 17)
5 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.