You would need an ISDN PRI to support CallerID.
in the PBX type: change isdn public-unknown-numbering
Ext Len - 4 (for 4 digit dialing in your dial plan)
Ext Code - 1 (for 1xxx extension)
CPN Prefix - 801555 (prefex to the extension)
Total CPN Len - 10 (ie 8015551000 - 10 digits)
when extension 1000 dials out he will have callerid of 8015551000
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