Well, I just got myself one of these

[url]http://cgi.ebay.co.uk/SIP-VOIP-PSTN-analogue-Adapter-Adaptor-New-ATA_W0QQitemZ150069015675QQihZ005QQcategoryZ131565QQssPageNameZWDVWQQrdZ1QQcmdZViewItem[/url]

This is the cheapest new unlocked ATA I've seen. Anybody come across one
before? It's a Pluscom VPA-11, and I can't find jack about it anywhere.
The only bad thing is that the PSTN port is a fail over, but there's a shed
load of other configuration items such as dial plans etc. It will store
more than 1 service provider and more than 1 account per service provider,
but you can only use 1 combination at any time. It does make it easier to
switch over to another service though, without searching for your settings.
Took me ages to get it going via the web interface, then I tried the PC
configure application that came with it, and suddenly it was registering no
problem. All in all, seems a bit of a bargain so far...