The best solution I think is to get your phone line off of Blueface. They do a deal where for 129 euros, you get all your calls for the year to any Landline in Ireland or the UK. As it is a VOIP service, it is delivered over your Broadband, so there is no landline rental seeing as you will get your BB from NTL. You can also keep/port over your eircom number to it.
No affiliation, just a happy customer with Blueface for 2 years now, quit paying landline rental 2 years ago.
Wexfordman
Edit:- You dont need to have your laptop on to use it either, it functions exactly like a normal Landline, you even use a standard phone with it. You just have to buy an adapter (called an ATA), or a router with an ATA built in (better option), which Blueface can provide.