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4.If the field in the Alternate Phone Numbers window is empty, click the Add button. In the Add Alternate Phone Number window, select the option Use dialing rules, then enter the area code and phone number in the fields above it. Select the destination country if necessary. Then click OK to close each of the configuration windows.
You are now ready to connect to your Internet Service Provider over two ISDN B channels simultaneously.
Internet access in Windows XP
In order to use