Ok, i give up... where are the SIP headers saved?

I applied a custom SIP header to one of the trunks that i set up but, the stranges thing is... I just cant find the entry in the .conf or .include files??? so far i can only see it in the Web interface. As much as i am a fan of your work guys, its just a lot faster to work on the files.

Please just tell me where to look, I have searched and look in each file.