asterisk: zoiper + grandstream fxo bad call quality

I've got my Asterisk box Setup with a Granstream FXO to connecto to the Land Lines.

I've got a FXS to connect the Analog Phones to Asterisk also.

Now, when I call from the Analog phones call quality is great, but when I call from a Softphone (Zoiper), call quality sucks. I've tried matching the Codecs (FXO has GSM as primary Codec) with no luck.

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