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To be clear, a FritzBox can easily act as a SIP registrar and thus integrate VoIP phones just like ISDN or analog phones used to. However, the range of functions of the FritzBox is unfortunately not comparable with that of a professional telephone system (PBX).
This article is based on a test on a FritzBox 7390. It was tested on a Telekom All-IP connection.
If you want to connect a new Fritzbox to a Snom phone and need help setting up the Internet access, you can find a small guide in this article.
The configuration of a Snom device on the FritzBox is relatively simple. First you have to create a new telephony device in the FritzBox - type is IP phone.
The user name and password are important here.
You should only allow registration from the Internet if you really need it. This is not necessary for an IP phone behind the Fritz Box and should therefore remain deactivated for security reasons.
With the setup of the Fritzbox most of the setup is done. Now you only have to set up the DECT base.
Since automatic provisioning is not supported by the Fritzbox, the Snom DECT base must be set up via your web user interface (WUI). To access the base, enter the IP address of your phone in your Internet browser (e.g. http://192.168.1.100). How to find out the IP address of your base is described in the following article: How to enter M300, M700, M900 - Web Interface
More information on how to add an extension to a Snom DECT base of the M series can be found here: DECT - 3.1 Add Extensions
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