Like others with holiday homes, workshops and the like, I've been somewhat resentful of paying full clip for a second Telecom phone line service which, in my case, is both poor quality and hardly used most of the year.
Now there's an alternative and you keep your existing number.
Vodafone have a Home Line Plus service for $25pm or $40pm if you want national calls included.
Although it's early days it seems to work very well and the only down side I can see is that it won't work if the power goes off. There are some other restrictions which don't affect us like no fax or monitored alarms.
There's a techie review here: