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ModemHelp.Net Recommends: Free System Scan for PC Errors

Error 20

1.  Make sure the correct modem is selected.

2.  Does the modem respond to diagnostics? It may need to be reinstalled.

3.  Is RNAAPP loaded into memory after closing the dialer? If so try the RNAAPP fix.

4.  Reinstall NCP/DUN/RAS.