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ISDN Configuration Help

I am not familar with ISDN and am a bit confused with the sample configs on Cisco site. Some use dialer interfaces,some not - some use dialer map or pool some don't, etc. I have a 2621XM with 4-port BRI NM connecting three remote sites with 802s. The BRI circuits are the only connections, these are not backup. Remote sites will need to communicate with one another as well as 2621. Circuits are dialup BRI (not leased-line) but should be up most of or all the time. Can someone get me started in the right direction ? Thanks, DJE

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