[Freeswitch-users] stripping sip-rh headers at the edge of my network

Inside my network I use sip_ph , sip_rh & sip_h headers to pass data around between boxes. however I need to strip these off at the edge ( SBC's running Freeswitch also ) will unset work with these headers in the 200 OK ( and other sip messages ) ? if not, how can I achieve this ? -- Sincerely Jay