I called 3CX and asked about support for the T46G, and they said by the end of 2013, which is too late for me. It's a shame, I like Yealink phones, really like the few T38G's I have, good price point, but I want the same phone for our 20 users, and about half of those are wall mounted, so can't use any Yealink at this point. They either don't have enough line buttons or they're not wall mountable.
I've narrowed down my search to Snom 870 + Snom Vision expansion module and Cisco 508G or 525G2, both with the SPA500DS expansion. All 3 of these phones give me at least 5 line buttons, wall mount options, and good feature sets. The 525G2 is also WIFI ready, which is a plus because I know I need that in a few locations. The Snom 870 has a USB-A port that can accept a WIFI USB stick, but that's another expense of course.
Anybody care to give pros or cons on these phones?