1) rooted
2) manufactured by HTC (NOT by Samsung, LG, etc.)
3) based on msm7k rather than on Snapdragon chipset (so it WON'T work on any Desire, N1, Evo 4G, etc.)
Supports call recording directly from the phone line, call filtering (b/w lists, exceptions) and call auto-answering (patched kernels ONLY, see http://code.google.com/p/rvoix/w/list for details).
