Dear Friends ,
I am facing a peculiar issue with ISDN .
For a particular customer , in a 3 tier architecture ,we use 2 backups .
backup 1 , if the leased line fails , the access router fires the isdn ,connecting it to the distribution layer .
If backup 1 fails , we manually fire isdn form the core router to the access site .
Now the issue is , I am not able to call my access site from the core . But strange enough , I am able to fire a test call to the core from the same access router.
I have racked my brain on this .
Need your help to arrive towards a solution.