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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 C520 WiMi.
To access the device, enter the IP address of your C520 WiMi into your Internet browser (e.g. http://192.168.1.100). To find out the IP address of your C520 WiMi, press the configuration key (gear icon) → "Status" → "Network". Confirm each with the checkmark icon.
Under "System/User Preferences" you can set the web interface to French and Spanish in addition to English, and the telephone language to German.
Until you have configured a Sip identity / extension, the three lamps around the speaker in the center will flash continuously. As soon as the extension is registered correctly, the lamps turn off immediately.
You can of course still change things like the ringtone, or the phone / web interface language under the menu item: "System/User Preferences".
By default, the C520 WiMi and web interface language is in English and can only be changed to French or Spanish.
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