[Freeswitch-users] Remove custom X headers in replies sent by the server

Hello, Is it possible to remove custom 'X' headers which are sent by the server to FreeSWITCH? I have the following call flow: Carrier ---> Load Balancer ----> FS(SBC) ----> SIP Proxy ----> FS (App Server) The SIP Proxy adds custom 'X' headers to the 200 OK received from the FS(App Server). The 200 OK is then sent back, with the custom headers, to the FS(SBC). Setting the variable: sip_copy_custom_headers, doesn't work. Is there a built-in function I could use, or another variable which can be set, so that the FS (SBC) removes all custom X headers for the responses? Thanks, Grant