[OpenSIPS-Users] CANCEL in t_relay() not forwarding user defined Headers

[Gupta, Rahul]

I am using opensips as a proxy, when a CANCEL to an INVITE comes in, its processed as follows

        # CANCEL processing
        if (is_method("CANCEL"))
        {
                if (t_check_trans())
                        t_relay();
                exit;
        }

in t_relay() seems like its creating new transaction for CANCEL and forwarding to the destination. However its not copying user-defined Headers which comes as a part of CANCEL. Is there a way to forward the other Headers ?

I also tried using forward(). In this case, all the headers are getting forwarded, however, the branch in Via header is getting duplicated from the incoming VIA header which is causing issues with the endpoint.

Question 1) If I use t_realy() for CANCEL, then how do I forward user defined Headers ?
Question 2) If I use forward() for CANCEL, then how do I get the Via Header with proper branch as created in INVITE ?

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