I'm looking to replace our NTL telephone service with a VOIP one using
the NTL broadband connection I've got.

I guess I could use an analogue telephone adapter (ATA), and use my
existing PSTN-based DECT answerphone.

I'm using a Linksys WRT54G router flashed with SIP@Home-enabled DD-WRT
(so I could then use a SIP-enabled wifi phone for around the house), but
as the cost of a standalone ATA appears to be about as much as a
replacement wireless router with built-in ATA, I'm also up for any
suggestions on replacing the router (as long as I can also flash it with
DD-WRT).

The only pain is that I also have a Sky HD box connected to the existing
phone line. Rather than replace the existing wired extension with an
alternative, it looks like I could use a wireless phone extender
(specifically the one advertised on
[url]http://www.netshop.co.uk/productcategorydetail.aspx?categoryid=55456[/url], as
most sites claim that alternatives don't work with Sky+ or SkyHD
boxes). Unless, of course, anyone knows differently.

Oh, and is there a way of doing this such that my existing NTL telephone
number could be used with the VOIP provider?

Thanks,

Ian