Tested on XP and Windows 7: Caller ID, Answering Machine, record voice all worked fine. This is a very small USB modem - good for use with both laptops and desktops.
Tested on Windows 7 64bit and 32 bit; answering machine functions work using drivers (v2.2.98.0) from Hiro's web site
Has a 60 second recording limit as with all soft modems.