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Conversion is apparently done - to use box also for landline you need to do changes in the cable. There are several posts in German showing how [thread=108051]contacts in FRITZ[/thread] have to be connected to dsl and telephone line. In short: middle contacts (PIN 4+5) in FRITZ-DSL/TEL connector transmit DSL signal - both neighbouring ones (3+6) are contacts for landline analogue telephone signals. You must connect them accordingly to your telephone connector.