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Outdated Drivers Can cause hardware related Errors. Check your PC Drivers now.

Error 681

1.  Make sure the correct modem is selected in the dialer.

2.  Reinstall the modem.

3.  Full uninstall and reinstall of DUN/RAS and its associated components.

4.  Try driver upgrades/inits.  Check into line noise.

4.  Refer to manufacturer.  Most likely a modem issue of some sort.