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

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