Release Notes FRITZ!OS 7.50 / 7.56

New features:

  • FRITZ!OS 7.56 - New energy-saving mode can be switched on upon request
  • FRITZ!OS 7.56 - Simplified replacement of a FRITZ!Box with new wizard
  • FRITZ!OS 7.50 - with over 150 new functions and useful improvements
  • Mesh Wi-Fi now with dynamic smart repeating for better performance in the home network
  • VPN with WireGuard technology: Simple, fast, and secure connection to the home network from anywhere
  • More convenient telephony: New FRITZ!Fon „Voice” ringtone and block for unknown callers
  • Many interesting new Smart home options: Scenes, routines, and lighting sequences
  • The user interface was fine-tuned and rounded out with comprehensive „Help and Info”
  • Many new functions for the MyFRITZ!App and FRITZ!App Smart Home (iOS/Android)

With each FRITZ!OS update, AVM also updates its security functions. Therefore we recommend performing the update for all devices.

Below you find a complete list and descriptions of the new functions in the latest FRITZ!OS, along with a list of further improvements in this version.

New features in FRITZ!OS 7.56


  • NEW Network devices can be limited to using the Internet via Mobile network or DSL/WAN (read more)
  • NEW Support of IPv6 for secondary internet access in fallback scenario (read more)

Mobile Communication:

  • NEW Support for Cell Broadcast Messages


  • NEW Support for telephony with the SIM card’s mobile telephone number via UMTS/3G (CSVoice) and LTE/4G (VoLTE) (6850 only) (read more)
  • NEW Support for telephony with the SIM card’s mobile telephone number via 5G (VoNR) (6850 5G only) (read more)


  • NEW In the new energy-saving mode, Wi-Fi, LAN and USB use even less power
  • NEW New wizard transfers all important Internet, telephony, and WLAN settings as well as connections to mesh, telephony, and smart home devices to a new FRITZ!Box (read more)

New Features in FRITZ!OS 7.50


  • NEW Automatic prioritization provides for fairly distributed data rates throughout the entire FRITZ!Box network (home network and guest network)
  • NEW VPN with WireGuard for simple setup of fast, secure VPN connections (read more)
  • NEW The MyFRITZ! direct connection allows you to receive information on the FRITZ!Box in real time on MyFRITZ!Net.


  • NEW In Mesh Repeater operating mode, connections to the Mesh Repeater with multiple Wi-Fi bands are now possible (read more)


  • NEW Call handling allows call blocks and call diversion (e.g. to answering machine) for callers „not in the telephone book” (telephone book as positive list)
  • NEW On a SIP DDI line for corporate customers, call diversion settings can be configured so that the caller number is displayed at the destination (partial rerouting)


  • NEW The new, optional „Voice” ringtone announces the name in the telephone book that matches the caller number, or the location and the telephone number. For an alarm or appointment, the ringtone announces the reason for the reminder (read more)
  • NEW The new FRITZ!Fon convenience function „Appointment Calendar” rings to remind about appointments

Smart Home:

  • NEW Configure and apply scenes to generate the mood for any occasion (read more)
  • NEW Create and enable or disable routines (if-then combinations) for automatic interactions in the Smart Home (read more)
  • NEW Templates for the comfort functions switch Wi-Fi access, switch Wi-Fi guest access, start telephone call, switch answering machine, send email (push service), and open web service (URL)
  • NEW Selection of an additional display of the temperature and humidity profile on the FRITZ!DECT 440
  • NEW Natural lighting sequences for device groups and templates with FRITZ!DECT 500
  • NEW Support for compatible external window sensors for the radiator controls' open window detection


  • NEW Support for storage media formatted in exFAT


  • NEW „Help and Info” in the user interface: A completely overhauled help function with many instructions based on user scenarios and a strong search engine


  • NEW MyFRITZ!App offers the option to enable prioritization for internet access on each home network device
  • NEW MyFRITZ!App allows home network devices to be renamed
  • NEW MyFRITZ!App allows a MyFRITZ! account to be created for MyFRITZ! internet access to the user interface of the FRITZ!Box (for iOS)
  • NEW FRITZ!App Smart Home supports scenes and the enabling and disabling of routines (read more)
  • NEW FRITZ!App TV allows the TV function (DVB-C) and station search to be enabled for FRITZ!Box Cable devices

Further Improvements of FRITZ!OS 7.56


  • Improved Detection of missing data connectivity in the mobile network (dead peer detection) (read more)
  • Improved Failure detection via DNS validation added for the primary internet connection in fallback configurations (read more)
  • Improved Ability to influence the time span for the transition from the primary to the secondary internet interface in the fallback scenario
  • Improved Failure monitoring triggers the sending of important messages in case of a fallback/refallback event with distribution to FRITZ!Box overview, push mail, events and also with notifications to FRITZ!Fon and MyFRITZ!app
  • Improved Completely revised logic for the routing of Internet phone numbers via DSL/WAN or mobile radio with resulting more flexible usage options in fallback and parallel operation
  • Improved Clarified wording when configuring WireGuard VPN connections
  • Improved NTP interoperability improved through better estimation of the hardware clock’s deviation
  • Improved Optimization of bandwidth reservation in the home network through adjustment to transmitted downstream rate
  • Improved Optimized switching from public DSN servers to provider-side DNS servers
  • Improved The setting to send all IPv4 data traffic of the FRITZ!Box via the WireGuard VPN connection to (!) a single device is no longer supported
  • Fixed “Reserve bandwidth in the home network” did not work with IPv6
  • Fixed During preparation of the first WireGuard connection via remote dial-in the FRITZ!Box ended up in permanent wait mode
  • Fixed In certain scenarios, switching the type of internet connection led to the WAN interface being switched to LAN
  • Fixed Interoperability of IPSec VPN connections to LANCOM remote sites including usage of VNC and RDP with active packet acceleration not available
  • Fixed MyFRITZ! access permission (device sharing) could sometimes only be terminated via IPv4
  • Fixed Occasionally an IPv6 prefix sharing of a previous “outdated” prefix for a downstream router was not deleted
  • Fixed On DS Lite connections, switching off IPv6 manually (incorrect configuration) could result in repeated dial-in attempts by the FRITZ!Box
  • Fixed On TIM connections (Telecom Italia), configuration of a WireGuard connection led to repeated clearing of the internet connection
  • Fixed Parental controls: Tickets for devices with the standard profile could not be redeemed
  • Fixed Possible interruptions to the LAN connection during operation behind certain fiber optic modems
  • Fixed Problems with functionality and/or display of the parental controls in certain application scenarios
  • Fixed Repeaters sometimes used external NTP servers for initial time determination even if the upstreamFRITZ!Box offered an NTP server
  • Fixed Under certain circumstances a switch to public DNS servers occurred although the current DNS server could be reached
  • Fixed Under certain circumstances a switch to public DNS servers took place too early
  • Fixed VPN: When configuring an IPSec-LAN-LAN connection, the address of the FRITZ!Box was not proposed
  • Fixed When all IPv4 data traffic was routed over a WireGuard VPN connection, incoming calls were not always signaled
  • Fixed When packet acceleration was enabled during longer LAN-LAN linkups to CISCO remote sites via IPSec, occasional connection losses occurred


  • Fixed Mesh Repeater operating mode: The “Select Wi-Fi Network” list did not display invalid Wi-Fi network names (SSID)


  • Fixed After changing the connection of a repeater, the connection display on the “Home Network > Mesh” page of the user interface was wrong
  • Fixed When using certain powerline adapters together with a network switch, the connection display on the “Home Network > Mesh” page of the user interface was wrong


  • Improved Robuster handling of inconsistent data in Apple telephone contacts
  • Improved Support for using up to 10 individual telephone numbers (MSNs) with the “Telekom CompanyFlex” rate
  • Change Outdated entries removed from the list of telephone providers


  • Improved Support for DECT headsets from the Sennheiser EPOS series for outgoing calls and picking up calls via the headset button

Home Network:

  • Fixed Devices with a dot in their name could no longer be renamed
  • Fixed Display for search for updates for devices in the Mesh was not suitable in certain cases
  • Fixed Possibly lacking rendering of IP addresses could cause subsequent defects


  • Fixed “Change notice” push service sent too often information on supposedly new port sharing
  • Fixed Repeater events were occasionally listed twice in the Event Log
  • Fixed There were too many events on changed settings in the Event Log


  • Fixed No network drive function (SMB) could be established to Rclone
  • Fixed WebDAV online storage could not be used when the country was set to “Spain”

Additional improvements in FRITZ!OS 7.50


  • Improved Higher connection quality and stability to multiple remote sites
  • Improved Optimizations for establishing connections with 35b VDSL profile to some LR-VDSL remote sites
  • Improved Adjusted calculation of available bandwidth in the user interface


  • Improved Extended user interface information for DOCSIS 3.1 (OFDM modulation and MER)
  • Improved Adjustments and interoperability improvements for DOCSIS connection
  • Fixed Incorrect OFDM(A) channel ID displayed under Internet/Cable Information/Channels


  • Improved When the DNS server of the internet provider (or the listed DNS server) is interrupted, automatic switch to the public DNS server
  • Improved Failure detection via DNS validation added for „Expanded failover protection”
  • Improved FRITZ!Box services (SMT, FTP, IGD and TR-064) offered via Bonjour or mDNS
  • Improved Unwanted queries from certain IP addresses to FRITZ!Box services can be blocked with the new IP block list
  • Improved „QUIC” added to the internet protocols supported by parental controls
  • Improved When internet access to storage media via FTP/FTPS is enabled, the randomly preselected port number is displayed
  • Improved Support for VPN user dial-in for Android mobile telephones and tablets with IKEv2 IPSec (preshared key)
  • Improved Optimized upload and download speeds by adjusting the TCP segment size (MSS clamping), now also for IPv6-based connections
  • Improved IPv4 VPN connections (IPSec) can be tunneled via IPv6, for instance to reach FRITZ!Box devices on DS Lite connections (IP6 tunnel for IPv4, IPv4-inIPv6)
  • Improved In the user interface, an image now illustrates the different types of VPN connections
  • Improved No publication of IPv4 address to MyFRITZ!Net on dual-stack connections with carrier-grade NAT; MyFRITZ! address always resolved here into the IPv6 address
  • Improved After a restart, the FRITZ!Box refreshes its IP address with MyFRITZ!Net immediately (DynDNS update)
  • Improved A FRITZ!Box in „Mesh Repeater” mode is automatically registered with the MyFRITZ! account of the Mesh Master
  • Improved IPv6 on the FRITZ!Box enabled by default for all internet connections
  • Improved FRITZ!Box can be operated on IPv6-only connections
  • Improved Support for IPv6 during prioritization of network applications and prioritization of a home network device
  • Improved The IPv6 Interface Identifier used on the WAN port is chosen at random
  • Improved Improved tips and error messages on sharing ports on DSL Lite connections with PCP support
  • Improved Data traffic from Wi-Fi calling (VoWifi) with smartphones prioritized over the FRITZ!Box internet connection
  • Change Predefined selection of DynDNS providers replaced by a general settings option
  • Change The „IPv6” tab is displayed for IPv6-only connections
  • Change Support for the User Service Platform specification (USP, Broadband Forum TR-369) and configuration on the „Provider Services” tab
  • Change When a new port sharing setting is created, the outdated „eMule” application is no longer listed
  • Change Outdated entries removed from the provider list for internet access
  • Fixed The ICMP identifier for pings was set to 0 by the FRITZ!Box in some rare cases
  • Fixed The FRITZ!Box could send an invalid Phase1 ID for VPN user dial-in via IPSec
  • Fixed The entry field for the IPv6 LAN prefix was too small
  • Fixed The IPv6 address could not be entered manually for IPv6 port sharing
  • Fixed Devices in the guest network with a captive portal were not connected to the internet via IPv6
  • Fixed IPv6: When SLAAC was used and the DHCPv6 server was disabled in the FRITZ!Box, after a restart IPv6 could not longer be used in the home network
  • Fixed In individual cases, deletion of a port sharing setting deleted additional port sharing settings of the same device
  • Fixed VPN connections (IPSec) to StrongSWAN via IPv6 failed under some circumstance
  • Fixed VPN connections (LAN-LAN) could not be saved without a name
  • Fixed In some scenarios the FRITZ!Box’s NTP server did not work after re-establishing the internet connection
  • Fixed Under certain circumstances, not all DNS servers made available by the provider were used


  • Improved When a radar event is detected, the system attempts to hold the channel with reduced bandwidth
  • Improved When encryption on the Mesh Master is changed to „non-encrypted”, activation of the 5-GHz Wi-Fi network is ensured and wireless devices are correctly deregistered if necessary
  • Improved Data rates increased when exchanging data with certain wireless devices
  • Improved The legend below the „Allocation of Wi-Fi Channels” diagram on the „Wi-Fi / Wi-Fi Channels” page is now displayed in a single line
  • Improved Optimized automatic channel selection when checking for prioritized use in the 5-GHz Wi-Fi network
  • Improved The adjustment of radio channel settings in the 5-GHz frequency band now allows all channel numbers to be selected
  • Improved The overlay with message on the „Load on the Current Wi-Fi Channel” diagram is now also shown when VHT160 mode is enabled
  • Change New message under „System / Event Log” when a new session key was negotiated (encrypted connections compliant with the WPA3/SAE standard)
  • Change Restructuring of the „Wi-Fi > Wi-Fi Network”, „Wi-Fi > Security”, and „Wi-Fi > Wi-Fi Channel” pages
  • Change MAC address filters are limited to a maximum of 128 entries
  • Fixed On the user interface for the „Wi-Fi Guest Access”, starting the WPS quick connection was linked with the „Wi-Fi / Security / WPS” page
  • Fixed Incorrect information when Wi-Fi disabled when „Internet connection via Wi-Fi” is selected
  • Fixed The period for displaying the load on the Wi-Fi channel could not be changed in the user interface when the 2.4-GHz Wi-Fi network was disabled
  • Fixed Sorting of „Other Wi-Fi Networks in Your Vicinity” table by name did not always work reliably („Wi-Fi / Wi-Fi Channel” page)
  • Fixed Preset name for Wi-Fi guest access linked to the language selection
  • Fixed When a WPS quick connection was started during the check for higher-priority users (e.g. radar), an incorrect message could be displayed under „System / Events”


  • Improved Higher data throughputs in the Mesh Wi-Fi possible thanks to dynamic smart repeating
  • Improved Display of home network connections on the „Mesh” page of the user interface responds more quickly to changes
  • Improved Home network devices (e.g. printers or NAS) displayed in the „Mesh Overview” can be opened directly by link
  • Improved Changed country and language settings of the Mesh Master are automatically transmitted to the Mesh Repeater
  • Improved New message in „System / Event Log” when FRITZ!OS removes a network loop
  • Improved „Mesh Overview” now shows network switches that use the LLDP protocol
  • Improved „Mesh Overview” now shows deployed network switches or access points in sequence
  • Improved Indication on the start page of the user interface when there are FRITZ! devices in the home network that are not yet enabled for Mesh
  • Improved Region and language settings of the FRITZ!Box are adopted by FRITZ!Repeater(s)
  • Change Registration of new Mesh Repeaters with the „Connect” button supports the „Wi-Fi 6 Device Provisioning Protocol (DPP)”


  • Improved Online contacts from,, and 1&1 converted to CardDAV
  • Improved Revised display of table of configured call diversions
  • Improved Encrypted telephony more robust against lost connections
  • Improved Optimization for integration of a telephone book into Mesh
  • Improved Designation of a caller’s telephone number in the call list, even when a telephone number specified by the caller was also transmitted
  • Improved Optimization of automatic configuration of telephone numbers by the internet provider
  • Improved Reworked texts for push services on fax function and answering machines on fax function and answering machine
  • Improved Support for more call scenarios with voice data transmission before call acceptance (P-Early-Media)
  • Improved Wizard for telephony devices enables configuration of internal fax function without enabling fax reception
  • Improved Display of certain table columns in the „Telephone Numbers” can be switched on or off
  • Improved CAPI over TCP can be disabled if desired via „Diagnostics / Security”
  • Improved Prioritization of telephony data adjusted to comply with the Deutsche Telekom specification 1TR112 V14
  • Improved FRITZ!Box takes note of the last 20 destination telephone numbers for call diversion and offers these when new call diversion settings are configured
  • Improved For messages on the answering machine, the name that matches the caller’s number in the telephone book, or the location and telephone number, can be announced while listening to messages
  • Improved Call diversion settings and call blocks for incoming calls can be restricted to a single telephone number in the home network
  • Improved Supports groups for online contacts from Apple
  • Improved Support for photos for online contacts from Apple, Telekom, and CardDAV providers
  • Change Different designations in the user interface for telephones on the „FON 1” and „FON 2” jacks
  • Fixed If the internal fax machine was used with the „only send” setting, incoming calls were not logged in the call list
  • Fixed Newly created telephone numbers could not always be edited retroactively
  • Fixed Root number was not displayed when the settings of the SIP DDI line were edited
  • Fixed Umlauts in the names of telephony devices were sometimes converted into special characters
  • Fixed Under certain rare conditions, the initiator of a three-party conference was not able to hear the two other parties


  • Improved Higher resolution of images from Google online contacts
  • Improved Convenient control of DECT headsets that are GAP or CAT-iq 2.x-compliant
  • Improved Quick dial for number keys 2 to 9 can be set up directly on the FRITZ!Fon by pressing and holding the numbers
  • Improved More convenient use of DECT handsets
  • Improved Three new ringtones with bird sounds available for FRITZ!Fon („Whistling”, „In the Woods” and „Yardbirds”) (configured under „MENU / Settings / Audio / Ringtone / Own ringtone”)
  • Change Missed calls older than 28 days are no longer signaled by a message key blinking red on the FRITZ!Fon

Home Network:

  • Improved Reworked details pages for network devices
  • Improved FRITZ!Powerline devices can be restarted in the „Device Details” of the FRITZ!Box user interface under „Home Network / Network” or registered by clicking a button
  • Improved Own network device highlighted in the overviews of the user interface
  • Improved More flexibility when assigning your own names for a network device in the home network for display in the user interface: Spaces and special characters are allowed
  • Improved The symbol in the user interface for prioritized network devices was updated
  • Improved Reworked user guidance through changing of the FRITZ!Box name

Smart Home:

  • Improved Template for radiator controls expanded with addition of comfort temperature and cool-down temperature as well as antifreeze and boost functions
  • Improved Sunrise/sunset schedule with more settings options independent of sunrise and sunset
  • Improved The „Adaptive heating start” function can be disabled for radiator controls
  • Change „Smart Home” menu subdivided into „Devices & Groups”, „Automation” and „Operation”


  • Improved Media data are read in completely with „Refresh index”
  • Improved A list of FRITZ!Box users with the right to access NAS contents is displayed under „Home Network Sharing”
  • Improved A message appears indicating when the maximum number of sharing links is exceeded
  • Improved After completion of fax configuration, a USB folder for storing faxes can be selected under „Settings for the Fax Function”
  • Change When uploading files to fritz.nas, the creation date of the respective file is now displayed
  • Change MagentaCloud removed as a media source in the internet because API is no longer compatible
  • Change After indexing, the „.start_indexation.mp3” file is no longer displayed via SMT/FTP
  • Fixed Added radio stations were displayed only after manual indexing
  • Fixed After starting operation of „FRITZ!Box as Mesh Repeater”, the network drive function (SMB) was not always available
  • Fixed Accessing a sharing link allowed the creation of additional sharing settings
  • Fixed During the slide show of FRITZ!NAS images, the control for the duration of the display was not displayed correctly
  • Fixed Folders in the uppermost level of the directory structure were not displayed in the selection dialog for moving files


  • Improved New display of Wi-Fi connections between FRITZ! devices
  • Improved Summary of information areas on the „Overview” page for better orientation
  • Improved New design and improved operation concept for logging in to the FRITZ!Box user interface (read more)
  • Improved Revised layout of the FRITZ!Box user interface (read more)
  • Improved Changed operating concept for changing settings in the user interface (read more)
  • Improved Under „System / FRITZ!Box Users / Apps”, the FRITZ!Box user from which each app has been configured is displayed for each app
  • Improved The „Forgot Password” push service email now contains information on the device that requested this mail
  • Improved If desired, the selection list of FRITZ!Box users can be hidden during login to the user interface from the home network
  • Change Simplified flashing behavior of the FRITZ!Box LEDs when connection is triggered by the „Connect” button
  • Change The hyperlinks for Contents, Manual, Tips & Tricks,, and Legal Notice are now located under „Help and Info”
  • Change New contents under „Help and Info / Get to Know the Functions”
  • Change Additional confirmation for configuring certain settings can no longer be switched off (read more)
  • Change The push service for the Wi-Fi guest access sends registration and deregistration events of the guest devices from the Mesh Repeater or Mesh Master with which the devices are registered
  • Fixed The display of several „Exposed Hosts” for two different devices under „Diagnostics / Security” was sometimes misleading

Mobile network:

  • Improved Expanded failover protection supports smartphones and mobile network dongles with tethering function
  • Improved Failure detection via DNS validation added for expanded failover protection
  • Change Simple failover protection removed - existing configurations are converted to expanded failover protection
  • Fixed Page at „Internet / Mobile Network” was empty when a mobile broadband dongle was inserted


  • Improved Use of a random SIP port possible under „Telephony / Telephone Numbers / Line Settings / Security”
  • Improved All a user’s rights listed under „System / FRITZ!Box Users”
  • Improved Information about security methods currently used on SIP remote sites under „Diagnostics / Security / Telephony”
  • Improved Display of the last ACS connections under „Diagnostics / Security / Provider Services (TR069)”
  • Improved While login is blocked due to an incorrect password entry, the password entry field can be edited for the next login attempt
  • Improved SIP port can be reached from the internet only by the set protocol (IPv4 or IPv6)
  • Improved Protection from frequent login attempts with incorrect password via the SMB protocol


  • Improved FRITZ!Apps support with explanation of where the preset FRITZ!Box password is found on the FRITZ!Box
  • Improved MyFRITZ!App shows when internet access is blocked for each home network device
  • Improved MyFRITZ!App with additional connection information for the home network devices
  • Improved When MyFRITZ!App is registered with a FRITZ!Box that has not yet been configured, MyFRITZ!App indicates this and offers to open the browser for configuration
  • Improved MyFRITZ!App displays Wi-Fi dual-band connections for „Your Mesh” in the overview diagram
  • Improved MyFRITZ!App reliably displays Mesh connection paths graphically, even for more complex constellations
  • Improved MyFRITZ!App indicates when Mesh functions have not been enabled in the Mesh Repeater
  • Improved MyFRITZ!App sets the name of the smartphone or tablet as the name of the network device in the home network of the FRITZ!Box if no name was assigned yet (for Android)
  • Improved MyFRITZ!App supports the convenience function of call diversion for callers „not in the telephone book”
  • Improved FRITZ!App WLAN displays the channel bandwidth of the Wi-Fi connection
  • Improved FRITZ!App Smart Home displays the adaptive heating (preheating phase) of radiator controls
  • Improved FRITZ!App Smart Home displays open window detection with a window sensor on the radiator control
  • Improved FRITZ!App Smart Home supports the creation of templates for the current light setting
  • Improved FRITZ!App Smart Home displays a message when applying templates

Additional Notes

Talking caller ID – FRITZ!Fon learns to speak: New features for FRITZ!Fon

New „Voice” Ringtone

The new „Voice” ringtone announces the name of the caller, if available, or the location the call is coming from along with the telephone number of the caller. The feature is available for incoming calls, but a voice announcement can also be selected for alarms and appointments.

When you get a call, instead of a ringtone the caller’s name is announced if their telephone number is in your contacts.

If there is no telephone book entry, the location from which the call is coming is announced, depending on the country, along with the telephone number of the caller.

You’ll need to have an active MyFRITZ! account.

This feature can be enabled under „Telephony / Telephony Devices” in the user interface.

Select the FRITZ!Fon handset you want to edit, assign one or more telephone numbers for incoming calls, and then switch to „Ringtones”.

Select there the „Voice” ringtone for the corresponding telephone number at the end of the list.

You can configure additional settings under „Voice Ringtone”.

For alarms and the appointment calendar you can select the „Voice” ringtone directly on the FRITZ!Fon.

Appointment Calendar

With the new calendar, you can now set up appointments in FRITZ!Fon and create a reminder for them.

You can also be reminded of the appointment with the new „Voice” ringtone.

Note: The new features are available for FRITZ!Fon M2, C4, C5 and C6 with the latest handset firmware.

WireGuard Support for Simple Setup of VPN Connections

WireGuard(R) is a modern, easy to understand, fast, and simple VPN solution.

For most operating systems, there are apps or programs from WireGuard for connecting single devices to a network via WireGuard VPN.

WireGuard is a registered trademark of Jason A. Donenfeld (

WireGuard is not compatible with other VPN protocols. Therefore it cannot connect to IPSec, OpenVPN and similar peers.

WireGuard itself does not contain any mechanisms for key distribution. Both parties therefore require the public keys of the respective remote site.

The concept for the FRITZ!Box is that both key pairs can be generated on the FRITZ!Box to set up a connection, and all the necessary dial-in data can be imported on the client side via a file or QR code, e.g. in the WireGuard App.

For your FRITZ!Box to be accessible via WireGuard VPN, you need a MyFRITZ! address your (you’ll need to register your FRITZ!Box with MyFRITZ!Net) – or a third-party DynDNS address for your FRITZ!Box.

Please note that the connection configuration – QR code or configuration file - is not permanently stored on the FRITZ!Box (for security reasons). Do not let the QR code or configuration file fall into the hands of unauthorized persons.

Mesh Wi-Fi – More Performance for FRITZ!Box as Mesh Repeater

FRITZ!Box devices that support „Mesh Repeater” operating mode could previously be connected to other FRITZ!Boxes or FRITZ!Repeaters only with one Wi-Fi band (2.4 or 5 GHz) at a time.

With the new FRITZ!OS, it’s now also possible to use more than one Wi-Fi band for the Wi-Fi uplink.

This enables higher data throughputs and stability in the Mesh. When updating a Mesh network that’s already been set up with an older FRITZ!OS, which consists of one or more FRITZ!Box devices in Mesh Repeater mode, the previously unused Wi-Fi band is connected automatically.

More Operating Convenience in the FRITZ!Box User Interface

The FRITZ!Box user interface has been visually refreshed with the new version.

Particularly noticeable here is the separation of the menu from the left edge of the screen and the width of the displayed pages have been trimmed for better readability.

This has a positive effect on tables and texts, especially when displayed on particularly large screens (resolutions), and at the same time improves the display on smartphones and tablets.

The redesign is based on a new style guide that facilitates the integration of innovative operating concepts.


Scenes – Create the Perfect Mood for Every Occasion

With scenes you can simultaneously perform different actions in the Smart Home.

For example, with the „Coming Home” scene, all radiator controls can be set to the comfort temperature at the touch of a button, and your LED lights and smart plugs, the Wi-Fi and/or guest Wi-Fi, and the answering machine can all be switched on at the same time.

The preconfigured two scenes „Coming Home” and „Leaving Home” and can be applied directly. They consist of automatically generated templates that can be subsequently turned on and off as required.

With a scene you create yourself, multiple devices can be combined and controlled.

Templates that have already been created can be added and deleted on an individual basis.

Furthermore, individual templates can be created as a simple scene. Settings for devices and/or device groups can be saved and reused with templates.

Scenes can be used via the FRITZ!Box, a FRITZ!Fon, FRITZ!App Smart Home or the FRITZ!DECT 440.

Routines - for Customizable Automations in the Smart Home

Routines enable devices, scenes and templates to be automatically controlled or enabled by an if-then link.

The shortcut consists of a trigger and a condition that must be met for an action to be performed.

In the Configuration Wizard, you can define a device as a trigger, then specify the change in state or an event (condition). Finally, a previously created scene or template (action) is selected, which is activated when the condition is met.

For example, if the humidity measured by the FRITZ!DECT 440 reaches a certain level, the previously configured scene „Ventilation” with a FRITZ!DECT 200 smart plug with a connected humidifier is applied.

Additional Confirmation

After this update, additional confirmation for certain settings and functions can no longer be disabled. However, if additional confirmation was disabled before the update, this condition remains intact after the update. AVM recommends always using additional confirmation for reasons of security.

To allow changes to protected settings from on the go, the TOTP standard with one-time passwords can be also used for additional confirmation. A freely available password manager or a separate app like the Google Authenticator can be used for this.

New wizard transfers all important settings

New wizard transfers all important settings for the internet, telephony, and Wi-Fi network, and connections to Mesh, telephony and Smart Home devices to a new FRITZ!Box.

Please take note of the following tips and requirements:

The Wizard provided in this FRITZ!OS offers assistance if you are using a FRITZ!Box that you would like to replace with another new FRITZ!Box. Any other FRITZ! products connected with your currently used FRITZ!Box, including FRITZ!Repeaters, FRITZ!Fons, FRITZ!DECT Smart Home products, and FRITZ!Apps will also be connected to the new FRITZ!Box.

This new switching function makes it easier to exchange your old FRITZ!Box with another FRITZ!Box, so that

  • the Wi-Fi and home network and all of the connected home network devices will work the same after the switch
  • no settings have to be changed on the devices connected with the FRITZ!Box because of the switch
  • the internet connection and telephony can continue to be used in the same way
  • all important settings on the currently used FRITZ!Box are transferred to the new FRITZ!Box (for instance, for telephony, Smart Home, and MyFRITZ!)
  1. Two steps must be taken to prepare the other, new FRITZ!Box:
    • a current FRITZ!OS version 7.55 or newer. During the course of the wizard you will be prompted to update your new FRITZ!Box if necessary.
    • Set your new FRITZ!Box back to its factory settings , if it was used at all before, and then disconnect it from electrical power.
  2. The currently used FRITZ!Box provides the internet connection on your line and has the latest FRITZ!OS version 7.55.
  3. If you use any FRITZ!Repeaters: Update their FRITZ!OS.
  4. If you use FRITZ!Fons or FRITZ!DECT Smart Home products, check whether a software update is available and, if so, install it.
  5. If you use FRITZ!Apps for the previously used FRITZ!Box, have your smartphone ready.
  6. You must have physical access to the FRITZ!Box you are currently using, so that you can insert its network cable and press the buttons. The other, new FRITZ!Box should be close at hand. You will also need to connect to electrical power and the internet for the switching procedure.
  7. If you are not only changing the FRITZ!Box model, but also the type of connection (for instance, from DSL to fiber optic), then the other, new connection must be ready for operation.
  8. You must be connected with the home network of the currently used FRITZ!Box with a notebook or computer (recommended) or by smartphone. Under "Wizards" in the user interface there is a "Transfer Your Settings to a New FRITZ!Box" link to click. Read the instructions presented there and follow them carefully. The process usually takes around 10 to 30 minutes, depending on the complexity of the home network.

Phone calls made easier with FRITZ!Box 6850: call directly via your SIM card's mobile telephone number (VoLTE/VoNR)

FRITZ!Box 6850 5G and LTE get a practical feature with the update to FRITZ!OS 7.56: telephoning using the phone number on the SIM card. That’s how it’s done:

With the new FRITZ!OS 7.56, the FRITZ!Box 6850 5G or LTE can make calls with a connected telephone via the SIM card. After the update to FRITZ!OS 7.56, you can use the mobile phone number on the SIM card for phone calls with a FRITZ!Fon.

If you already have a mobile phone tariff with a high data volume and voice flat rate, you can use the data volume on the FRITZ!Box by booking a MultiSIM, which is usually available very cheaply, and also use the associated mobile phone number to make calls with a connected telephone. When using a MultiSIM, both the smartphone and the telephone on the FRITZ!Box ring at the same time for incoming calls. Alternatively, it is also possible to use a mobile phone tariff exclusively for the FRITZ!Box. This gives you your very own mobile phone number for your home.

This new feature enables new convenience: You can make calls at home using a FRITZ!Fon while your smartphone is charging. Thanks to the DECT connection of the FRITZ!Fon, you have the best reception anywhere at home - even where mobile phone reception is weak. And in the home office on the FRITZ!Box, you can use the mobile phone number with much greater convenience than on a smartphone, since the complete range of functions of the telephone system integrated in the FRITZ!Box is now available for this.

FRITZ!Box supports telephony in LTE and 5G networks

The prerequisite for telephony via the SIM card is that the tariff supports Voice over LTE, which is now standard for tariffs for internet and data use.

FRITZ!Box 6850 5G is also prepared for telephoning in 5G standalone networks and also supports Voice over New Radio (VoNR or also called Vo5G). This means that the FRITZ!Box does not have to switch to the LTE standard for a telephone call with an existing 5G standalone connection. The first providers in Europe have already announced that they will soon be making Voice over New Radio available in their network.

This is how it works: Set up telephony via the SIM card

Call in a web browser the user interface of your FRITZ!Box and once you’ve logged in click on the “Telephony / Telephone Numbers” menu item. From there, select the option “New Telephone Number” and then “Mobile telephone number”. Now enter your mobile number (without country code) in the corresponding field and then click on “Apply”.

… and you’re ready to start making calls.

New and improved functions for parallel and fallback operation

With the update to FRITZ!OS 7.56, the FRITZ!Box 6890 LTE has a whole range of new and improved functions relating to the operating modes failure protection (fallback) and parallel internet access (parallel operation of mobile communications and internet access via DSL or WAN):

I. Restrict network devices to Internet use via mobile network or DSL/WAN

The data traffic of a specific network device cannot always be transmitted via any Internet interface. If, for example, internet connections from different providers are used in parallel operation and a certain service such as IPTV is only available via one of the two providers used on the FRITZ!Box 6890 LTE, then FRITZ!OS 7.56 can now be used for a network device such as an IPTV set top box can be assigned a specific Internet connection. This new setting option can be found under Home Network/Network/Network Connections - and here in the properties of the respective network device in the “Access Properties”/“Internet Connection” section.

II. Support of IPv6 on the secondary internet access in the fallback scenario

With FRITZ!OS 7.56, if the primary internet connection fails, not only IPv4 is provided via the fallback connection, but also IPv6, provided this is supported by the provider of the secondary internet connection.

III. Detection of missing data connectivity in the mobile network (dead peer detection)

In mobile networks it can happen that the network terminates an inactive mobile connection of its own accord, but the message that the termination has been completed cannot be successfully transmitted to the mobile device. In such cases, the modem of the mobile radio device then assumes that the mobile connection continues to exist and can continue to be used if necessary. FRITZ!OS 7.56 now has what is known as Dead Peer Detection, which is always active in the background and can be used to automatically detect and resolve such deadlock situations - without user interaction, i.e. completely self-healing.

IV. Failure detection via DNS validation for the primary internet connection in fallback configurations

An additional possibility of failure detection on the primary Internet connection is now available with DNS-based failure detection. Like dead peer detection, this is based on the fallback to public DNS server function, which is also new in FRITZ!OS 7.56. In many cases, this can accelerate the detection of a failure or, in certain scenarios, make it possible for the first time (IP client configurations).

V. Setting option for the time span of the transition from the primary to the secondary internet connection in the fallback scenario

Immediate transition to the fallback connection is not always the best option after the primary internet connection fails. FRITZ!OS 7.56 therefore now offers a setting option for the time between detection of the failure and execution of the fallback to the secondary internet connection. There is also another new setting option for the period of re-fallback in the event that the secondary Internet connection becomes usable again.

VI. In case of a fallback/re-fallback event, failure monitoring triggers the sending of important messages with distribution to the FRITZ!Box overview, push mail, event section and messages to FRITZ!Fon and MyFRITZ!app

With the fallback function, the FRITZ!Box 6890 LTE offers the highest level of reliability for the Internet connection. As a user or administrator, you can sit back and relax and let the FRITZ!Box handle the internet connections completely, but sometimes it’s still helpful to know whether the internet connection is currently being established via the primary or the secondary internet connection. In addition, not every outage is self-healing and sometimes the service of the Internet provider affected by the outage has to be contacted. In order to be able to stay up to date in this regard, the FRITZ!Box 6890 LTE now sends so-called “important notifications” via various communication channels in the event of fallback or re-fallback events - such as push mail, FRITZ!Fon and MyFRITZ! app.

VII. Completely revised logic for the routing of Internet phone numbers via DSL/WAN or mobile communications with the resulting more flexible usage options in fallback and parallel operation

Sophisticated logic in the FRITZ!Box 6890 LTE decides when which phone number can be used via which internet connection. This is extremely helpful, especially in parallel operation, but also helps in fallback operation, using telephone numbers that match the Internet connection currently in use for telephony via the FRITZ!Box telephone system. With FRITZ!OS 7.56, this logic has been completely revised and perfected.