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Error 678: Modem failed to negotiate at a particular modulation protocol (V.32bis, V.34+, x2, or V.90). Our modems can't answer the handshake due to receiving garbage signals from a customers' modem
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This is an exerpt from a tech support Knowledge Base. What I think is happening is that the ISP you try to use the external modem on does not support v.92. The other thing you can try is to disable error control in the modem properties.
As a last resort contact the modem manufacturer and get a modem INIT STRING to force the modem to v.90 instead of v.92.
Let me know if this helps.