Sagem RL302 and Fritz! Box 7170

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Hello,

I tried the days here, my Fritz! To connect box 7170 with the GSM adapter Sagem RL302. If I attach a telephone directly to the adapter function also, but if I the adapter to the Fritz! Box attaches, has I a constant, very disturbing humming in the telephone. What can be? Can one solve the problem somehow?

Thanks,
Siemens fan