[Freeswitch-users] Adding X-CID custom header for sipcapture integration

Hello, I am trying to add custom X-CID header to copy call id from a-leg to b-leg in order to make work call flow in sipcapture. I set channel variable sip_h_X-CID to add it to b-leg, I can see it is setted up but outgoing b-leg request does not contain the header. If I set up sip_h_B-CID it works but sip_h_X-CID not. Do you know why? Any other way to add the header? Regards