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Netopia ISDN Modem User’s Guide
Placing calls with DOS
If the D channel LED indicates a proper connection to the ISDN 
switch, you can place your first call. You can use any standard 
communications application that recognizes AT commands. 
Note: Most areas require you to dial ISDN calls with 11 digits (for 
example, 1-800-555-1212), even for local calls.
Note that you must use Multilink PPP to make calls using two ISDN 
B channels. For information,