I have recently purchased a BT Premium handset (with Call Guardian) because having just joined VM, we started receiving silent calls almost immediately despite being registered with TPS. However, when we receive a call we can hear the caller but the caller can't hear us. I have checked that the phone is correctly plugged into the socket at the rear of the hub (via the short adaptor provided by VM) and into the handset base, that its not on mute, that outgoing calls are allowed. The line was working perfectly with an old panasonic cordless handset prior to change. As we're social distancing, we can't test the new handset in another household. Does anyone know what might be causing this problem; hub settings etc? Any assistance is appreciated.