Well if you have a PRI you can send ANI.
change isdn public-unknown-numbering
Ext Len - 4
Ext Code - 1
CPN Prefix - 801555
Total CPN Len - 10
That is an example. for a 4 digit dial plan. extension 1xxx would have a ANI prefix of 801555
So extension 1505 would show ANI of 8015551505
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