Send SIP message when parking?

I have some Snom 821 phones that will display SIP messages; it would be really, really nice to have them display things like the slot that the call you just parked was sent to, or the extension of the person that just paged over the PA system…That all seems doable in asterisk, but I’m at a loss as to where I would insert bits into the dialplan in freepbx. Where would I put these things? I’m running

Take a look in the documentation under “extensions_custom.conf” you make also need to use an override file. FreePBX has loads of hooks in the dial plan.