I tried several voice modems with Answering Attendant and they all worked (with the exception of caller I.D.) until I got Vista. Just finding a 56k modem to work with Vista was tough...most are evidently manufactured based on ancient designs. This one was just designed a couple of years ago so I took a flier. It not only works well, but for the first time I have caller I.D.!!!!
Like I said, your experience may be different...
Regards,
Chuck