Ld 16 RDB under ISDN. This can be printed out in ld 21. There may be a gate opener so take a look at your docs to confirm if you are trying to program it, it is not in all routes.
The error you are seeing, most often occurs on a tie line between PBX's where both PBX's think the number is in the other. So when you dial from A to B, B just sends it back, then A sends it back and so on until all your channels are used up. Of course I am sure there are other examples of how this can occur too.
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