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ModemHelp.Net Recommends: Free System Scan for PC Errors

Error 677

1.  Make sure that they are dialing the correct number.  This includes if they should or shouldn't dial the area code, a 9, etc...

2.  Are they hearing a voice?  Not hearing a modem tone?  Make sure that the POP isn't having any sort of issues.

3.  If they hear a connection sound, try R&Ring the modem, updating drivers, inits, ATZX0(reset and blind dial) as an init, etc...