Thanks for reaching out!
Unfortunately this is unable to be done. You can divert your landline calls to your mobile service however this means the calls will only ring on your mobile and not your landline.
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@z_hook Optus VOIP services are not viable for some home users, cost does not justify purpose. I was looking at turning my Home Phone into either an old Mobile Phone or fixed wireless landline phone Android 7.1 with 2sim & SD card. AU VOIP is more for business purposes, there is a huge need for people like me, who just want to control their Home Phone & Mobile Phone Records from their PC.