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http://www.cableforum.co.uk/board/sh...ad.php?t=31669
http://www.cableforum.co.uk/board/sh...ad.php?t=31708
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this is a wireless VOIP phone:-
http://www.broadbandbuyer.co.uk/Shop...ShopGroupID=77
the only one that I know of which will work provided you have a wireless router (in theory). it effectively replaces you DECT phone. your alternative is to buy a 'box' like this:-
http://www.broadbandbuyer.co.uk/Shop...ProductID=2222
this box plugs into your router and you then plug your standard BT connector into the box - so you could plug your answering machine and DECT base unit into the box and use your existing setup.
vonage isn't something I'd recommend if you're doing loads of outside the UK calls as they aren't a true VOIP provider - they are an alternative telcoms company which provides cheap rates by using VOIP.
look into other VOIP providers before you jump in with vonage - also note vonage hardware which you pay up front for at around £30 also has a very sneaky concealed £25 cancellation charge if you want to leave them plus their hardware is locked so it's a nice door stop when you decide to change to another voip company.
vonage are great though if you aren't wanting to get into the technical side of it and want a quick plug/play solution - also best for those who make loads of uk calls as vonage charge £10 a month which includes all your uk landline calls.
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if you're wondering what the bandwidth required is - it's 64k each way which means the base NTL 1m product will work BUT if you do lots of uploading etc then you might consider either upgrading to a higher tier or setting up QOS priorities on your router.
I'm with sipgate and I use the linksys PAP adaptor which I plug a normal BT phone into. It cost me £50 to setup but now I dont pay any monthly line rental. Sometimes my calls aren't too good (echoy) but often the line quality is better than the BT line I had. It's early days so I accept it's not perfect yet.
There are some companies which offer deals like 500 worldwide mins for £5 a month - probably the kind of solution you're looking for.
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some useful links for you:-
www.voipuser.org - loads of help here including a forum
www.voiptalk.org/products/index.php - another provider