[OpenSIPS-Users] B2b custom_header not working!

[Jorge Henrique Pinho]

Hi all,
I have installed opensips-1.7.2-2.el5 and I am using b2b module.
I need to preserve some headers that b2b module changes. I was using avp and textops modules in local_route to accomplish that. But this lead to unexpected behaviours by opensips.
So i define the custom_headers variable in my configuration (http://www.opensips.org/html/docs/modules/1.7.x/b2b_logic.html#id250020), and the message that b2b passes to the other side of the dialog has the preserve headers repeated. One header with the original value and other with the new value generated by b2b module.
Is this the correct behaviour? How do i solve this?

Thanks in advance,

Jorge Pinho