Hi guys I’m trying to send custom variables via sip header (name, address etc) it’s only working when I use all lowercase (firstname). The problem is that I need to use upper case for one of my integrations. As soon I use (FirstName) it fails to use the variable. It states in the docs that: Header names are case-insensitive (e.g., X-First_Name, x-first_name, and X-FIRST_NAME all work). Anyone had any experience of this?