From the docs of Win32::RASE:

$hrasconn = RasDial($EntryName, $PhoneNumber, $UserName, $Password, $D
+omain, $CallbackNumber);


 $EntryName   - RAS/DUN entry, the only mandatory parameter
 $PhoneNumber - an overriding phone number (if not needed - use "" or 
+undef).
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Jouke Visser, Perl 'Adept'