Outgoing caller id

Hello, maybe I am missing something but i am looking for help, 
i set up a S20 Phone System with one SIP Trunk, is there a possibility
to set the caller id.  I.E. when extension number 12 dials out, the other person can see from which extension the call was initiated.  Now everyone can see the main Number only, 

Is this something i can set in the phone system, or do i have to contact the service Provider of my SIP Trunk?


Thanks for Your help



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