If I have a NP 4B module on my 4500M, can I use it alone with an ISDN simulator? Or should I really have another ISDN capable router to practice ISDN configs. I was thinking I could use the 4 Bri ports to my advantage. I'm afraid it doesn't make sense to pass traffic to interfaces on the same router, but maybe for the sake of ISDN it doesn't matter that much.
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