Will this work on a Windows 8 box?

Yes. Windows 8 drivers are found at zoomtel web site if you need

if I hook this to a voip line can I send/recive fax?

I think that a lot depends on your fax machine, your ISP, and your VOIP service. Some fax machines (I found this in the Brother MFC-7860DW) state in their documentation that they have a special setting to support VOIP., however I haven't tried that. My experience with an older fax machine and older cable modem was not very good. Some faxes went through alright, some didn't.

Questions & Answers: Zoom 3095-00-00G Mini External Modem

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Zoom 3095-00-00G Mini External Modem 56Kbps USB Data: V.92, V.90, V.34, V.32bis, V.22, V.23, V.21, Bell 103/212A Compression: V.44, V.42bis, MNP5 Error Control: V.42, MNP2-4 Hayes AT and extended AT command set compatible USB version 1.1 co

56Kbps
USB
Data: V.92, V.90, V.34, V.32bis, V.22, V.23, V.21, Bell 103/212A Compression: V.44, V.42bis, MNP5 Error Control: V.42, MNP2-4 Hayes AT and extended AT command set compatible USB version 1.1 compliant

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