Hi,
If I get a second Google Voice phone number dedicated to fax only, is it possible to connect a fax machine to my Obi202 box and send and receive faxes to/from other fax machines as one would using a standard landline such as ATT?
Yes, in many cases.
Is a second, separate phone number required to do that? Dedicated to fax only?
It is not a technical requirement to have a separate dedicated GV number for fax.
http://www.obitalk.com/forum/index.php?topic=12279.msg78278#msg78278