Gateway none - Manual (Page 50)

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CHAPTER 4
4.3.4.4 Dial-up on Demand - Modem
If you are accessing the Internet via an ISDN TA or PSTN
modem attached to the serial port on the Gateway, then you
must specify your account information on this screen as
described below:
Check if you only use a dial-up modem to connect to the
Internet - If the serial port is used for primary Internet
access, then mark this item. If not marked, then this connec-
tion will only be used for backup access if the primary
WAN link fails.