[cisco-voip] line protocol down in BRI interface

[anand]

Hi i have BRI interface cards on cisco 3845 router.I connected to ISDN
simulator.The show ip interafce on the router says the line is up and
protocol is down.

The isdn simulator i used is ADTRAN ATLAS 550.Can someone help me why the
proctocol is down.

The interface cards are for voice.
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