Also this might be more relevant to your needs;

http://lists.freeswitch.org/pipermail/freeswitch-users/2011-July/074657.html
http://jira.freeswitch.org/browse/FS-3439

Cal

On Mon, Jul 1, 2013 at 4:39 PM, Cal Leeming [Simplicity Media Ltd] <cal.leeming@simplicitymedialtd.co.uk> wrote:
Is this what you are looking for?

http://wiki.freeswitch.org/wiki/Strip_SIP_Headers

Cal

On Mon, Jul 1, 2013 at 4:14 PM, Mino Haluz <mino.haluz@gmail.com> wrote:
Hi,

I cannot remember the variable you should set when you want FS to do not strip custom X- headers received on inbound leg. Anybody?

Thanks,
M

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