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Cisco IP Phone SPA303 and Internet Box2

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Hi, just installed new fiber router and configured 2x Cisco IP SPA303 phones, both phones are registered in the telephony service into Swisscom Box2 router. It's possibile to receive and make calls with the right registered numbers but... how to end a call? If I hang the headset, SPA303 drop at local 'side', but in the other side the call still alive...

If I call my smartphone, I don't answer, I hang the Cisco Headset but smartphone continue to ring...


How to terminate a call ? What's wrong?