coffeebaron: Approx. where are you? I.E. road / near (don't post exact address). Looks like a mix of RBI DSL and DSL1 around the place, so your speeds may not be good for consistent VoIP.
If voip is not an option, then it would be possible still.
1) Get a line from 2talk cost ~$10 per month
2) Enable simultaneous ring, with the landline phone number enabled after 3 seconds.
3) Connect an old telecom Caller ID unit to the voip ATA
When a call comes in, the caller ID unit will display the CLID from the voip ATA, but if you pick up on the landline you can handle the call without needing to transport the audio over voip.
My parents do this - in a roundabout way.
The PABX in their house doesnt forward the trunk incoming CLID through to extensions. So they have one of the old telecom units wired up to the trunk line before it goes into the pabx. It sits in the lounge where they can easily see it before picking up the phone.
The cost of the forwarded calls from the 2talk line to the landline are pretty much free - I think they have a fair usage policy of 2000 minutes a month which is alot of incoming calls.