So this is well-intentioned but weird. Telstra is selling a phone which is designed to stop scam callers, by requiring them to say who they are before you actually answer.
If you install the $72 Telstra Call Guardian 301, then each caller will be required to announce their identity before they ring you, and you'll hear that information when the phone rings. You can specify the numbers of friends and family on a contact list so they get straight through. Most scam callers hang up when they encounter an answering machine, and we'd imagine most of them won't be able to tell the difference between this and a standard answering machine.
This certainly isn't the worst idea we've heard, but in an era where landlines are being abandoned in favour of mobiles, it's something of a throwback. And really, it's still more fun to string out those calls as long as possible, thus wasting the scammers' time.
Tired of nuisance calls on your home phone? [Telstra Exchange]