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The prompt
Dest B1 Phone number :
will appear beneath the previous prompt.
Choices:
Type the ISDN phone number of the remote router
you are calling.
Some ISDN lines have two phone numbers. If this is the
case, type the ISDN phone number corresponding to
channel B1 here.
Type nothing if you do not wish to use the B1-channel.
Press the Enter key when you are ready to continue.
CONFIGURING WITH A LOCAL CONSOLE