Hi Wolfgang
to connect a phone to an ISDN NT board you need to cabling a ISDN
crossover  cable (is differento ethernet) like scheme:
Keep a ethernet cable cut in the middle and connect the wire 3
with 4, 4 with 3, 5 with 6, 6 with 5 also you need to add two 100 ohm
resistors One must be connected between pin 3 and 6, and the other
between 4 and 5. To make this cable i suggest to use a Mammut connector.
Sincerelly
Dimitri

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