I am now usining a Telstra Call Guardian 301 phone, connected to my TPG Modem using VoIP. The phone can be set like a mobile to only accept incoming calls for a VIP list that you add to you phone. So, only my family & friends and a few select numbers can call me. The rest go to the answering machine. It also blocks all non VIP call at night. (I got to set the block, start time & finish time) I brought the phone second hand to try it, as i had two other cordless home phones, with better voice quality, but now with my TPG NBN, the sound quality is fine.
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