[Asterisk-Users] Hide outgoing CallerId on Zap interface

[Mickey Binder]

Hi there

I know I have asked a somehow similar question earlier but since then I've
tried some different things which isn't working.

I want to completely hide my outgoing CallerId when dialing out on my Zap
interface.
I've tried a lot of different settings in sip.conf and hoped that zap would
hide the CallerId if sip was told to do so, but that wasn't the case.
Then I've tried to set hidecallerid=yes in zapata.conf (and restarted *) but
this only results in my main number CallerId being displayed. 
Is it somehow possible to completely hide the CallerId, like when someone
from a secret number is calling and the display on my mobile says
"Secret number" ?

And if that is possible, is it then possible to do it on a per-user basis
configured via sip.conf?

regards,
Mickey Binder