Hi,I hope somebody can help me. I connected a Sennheiser PC320 G4ME headset vià two adapters to the IP Phone SPA525G:1. 2x male 3,5mm -> 1x female 3,5mm2. 1x male 3,5mm -> 1x female 2,5mmThe male 2,5 mm side I have plugged into the phone. Now the exp...