[Freeswitch-users] Passing custom sip headers using re-invite

Hi I need to pass some custom sip headers between 2 fs boxes after the call is established. To do this I'm using "uuid_setvar sip_h_X-myvar=value" on the channel and calling uuid_media_reneg to create a re-invite, fs is sending out the re-invite with new custom headers but the other fs box is not adding these new custom sip headers to the channel. How can I make fs to set new custom headers on the receiving side of the re-invite? fs1 ----invite---> fs2 .... call is established fs1 <---re-invite--- fs2 (re-invite with new custom sip X headers) fs1 ... not adding new headers to channel thanks