well the dtmf detection is pretty good from what I have been using.
but if you want to run a commercial system you are better off with BRI card.
and if you have the money then it doesn't really matter, using the SPA has the advantage of not having to run a linux box.
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found this device which actually does kind off what you want using skype http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&it em=9717093504
well the dtmf detection is pretty good from what I have been using. but if you want to run a commercial system you are better off with BRI card. and if you have the money then it doesn't really matter, using the SPA has the advantage of not having to run a linux box.
A few people have suggested an asterisk box, easier solution the SPA-3000 by Sipura/Linksys I have explained it a little in my blog. http://netgaddi.blogspot.com/2006/03/voice-over-in ternet-voip-telephone.html