OK, so this isn’t exactly news. I’ve been using OnSIP with Polycom IP650 & 550 and a few months already. I hadn’t expected them to support wideband at all but was pleasantly surprised to find that their new conference bridge handles it just fine.
Further, if you’re using suitably capable Polycom or snom phones then calls placed through OnSIP will negotiate to G.722 and voila, much clearer calling. They had a blog post about it a short while ago.