RASDIAL (Dial Up Networking)

Manage RAS/DUN connections.

Dial a RAS connection:
   RASDIAL entryname [/PHONEBOOK:PhonebookFile]
                [/PHONE:PhoneNumber] [username [password|*]] 
                [/CALLBACK:CallBackNumber]
                [/DOMAIN:domain][/PREFIXSUFFIX]

Hang up a RAS connection:
   RASDIAL [entryname] /DISCONNECT

Display RAS Status:
   RASDIAL

To use this command requires that Dial Up Networking Service be installed (via Control Panel - Networking)

The default location for PhoneBook entries is \%SystemRoot%\system32\ras\

"If advanced switching technology had not been developed and the telephone still had one operator for every 120 of some 100 million telephones, it would take 2,400,000 telephone operators (on three shifts) ~ John R. Pierce

Related:

RASPHONE - Manage RAS connections.
RASMON - Windows 2000 GUI Resource Kit tool.
CHECKRAS - SMS support tools