Hey everyone, I’ve been banging my head on this for a while and could really use some insight. I’m trying to send custom variables through SIP headers (like name, address, etc.), and everything works fine when I keep them all lowercase (e.g., firstname). But here’s the frustrating part I actually need to use uppercase for one of my integrations, and the moment I try (FirstName), it just completely fails. What’s confusing is that the docs clearly say header names are case-insensitive (like X-First_Name, x-first_name, X-FIRST_NAME should all work). Has anyone else run into this issue? Any experience or advice would mean a lot right now.