Hallo all, 

I defined  branch_failure routing  block via t_on_branch_failure()

In the branch_failure route, in case of "408 Request timeout" I am sending CANCEL with reason "t_cancel_callid("$ci", "$cs", "22", "408")".

If the t_cancel_callid("$ci", "$cs", "22", "408") is called in  branch_failure for branch idx 0, the CANCEL is sent, but Reason header is missing there.

Why?  (I expect that t_cancel_callid() should insert Reason header regardless of branch it is called from)

If the t_cancel_callid is called in branch idx !=0, the CANCEL contains Reason header with cause as expected.

Thanks for clarification of this behavior, 

Pavel.  

P.S. code snipset:

event_route[tm:branch-failure:primary]

{

 if ($T(reply_code) == "408")

    {
        if ($avp(branch_idx) == $T_branch_idx)
        {
            if (t_cancel_callid("$ci", "$cs", "22", "408"))
            {
                xlog("L_INFO", "CANCEL sent ci:$ci, cs:$cs 408");    
            }
            else
            {
                xlog("L_INFO", "CANCEL not sent ... ci:$ci, cs:$cs 408");
            }

            $var(_palotmp_) = "sip:" + $avp(replaced_cfnry_target_number) + "@" + $dd + ":" + $dp + ";user=phone";            
            append_branch($var(_palotmp_),"1.0");

            t_relay();
            return;
        }
    }

}