All landline providers have long been handling telephone calls over the Internet, i.e. using Voice over IP (VoIP). But what about the security of these connections, can they be eavesdropped and how can you protect yourself against them if necessary?
Internet telephony: Encrypt calls via the Fritzbox
The short answer is: if the IP connections are not encrypted, the calls can also be monitored. But the details are complex. After all, Fritzbox owners from software version 7.20 can now protect themselves comparatively easily. Provided that you are a telephone customer at Telekom or one of the few other providers that support the SDES-sRTP transport encryption.
Since the firmware update to version 7.20, the Fritzboxes have enabled telephone calls to be encrypted – provided the provider supports the function.
This is how it works: Open the router’s user interface by entering fritz.box in the address line of the browser, continue via “Telephony -› Your own phone numbers ”and click the round edit icon on the far right of your phone number. If you click on “Additional Settings” below, the “Encrypted Telephony” option will appear. Please activate it and confirm with “OK”.
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