This will depending on what your carrier will allow. Or what you are paying for. As well as what you have configured.
Take a look at your "change public-unknown-numbering 4" change the 4 to what ever your length of extension is.
We've been able to do crazy things, like send out just a 4-digit number as an individual station's caller ID. Be advised, though, that some commercial PBX systems will block "odd" caller ID's and send you to a recording. Easiest to test by calling your cellphone. N-Joy!
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