External ISDN device

I have to connect a linux box to the Internet through an external ISDN device. I have read the ISDN4Linux stuff but everything there is about internal devices.
Should it be treated as a normal modem connection using pppd?
Do I need task-dialup-isdn at all?

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Daniel de los Reyes
S2-Selling Soluciones
Valencia Spain
e-mail: dadecal@s2-selling.com
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