Filter a double call from the same number


I have a S20 PBX with a 2 fxo module. The analog lines come from fiber router that has two outputs (two line with the same number). When a call arrives both lines ring simultaneous, so the PBX considers them as two distinct calls. Every time in the phone I see a call and a call waiting from the same incoming number.

Is it possible filter the second simultaneous call, so in the phone I see them coming one at a time

Thank you very much


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