Generate anonymous calls

Good morning,

I would like to call all my calls as anonymous, but with the correct PAI or RpID headers to identify the real from number and the privacy on. I have tried the configuration of the trunk “hidde CID” but is sending the PAI as: anonymous" sip:[email protected];party=calling;screen=yes;privacy=off
I need something like:
anonymous" sip:[email protected];party=calling;screen=yes;privacy=on

How can i do that?

Thanks you in advance