I've used a Linksys WRT54GL (w/ Tomato firmware) successfully with a SPA3102. I recently (last week) switched my 3102 to a Zoom 5801 (had FXS echo issues) and that works perfectly with the WRT54GL too.
Can't go wrong with Buffalo routers either, I believe you can get them with more ram and faster cpu compared to the Linksys routers. They too take the same third party firmwares.
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