Re: How to remove Reason HF from branched CANCEL?

Hello,

did you played already with 

- local_cancel_reason
- e2e_cancel_reason

from the tm module?

Cheers,

Henning

-----Original Message-----
From: Benoit Panizzon via sr-users <[email protected]> 
Sent: Tuesday, May 13, 2025 10:45 AM
To: [email protected]
Cc: Benoit Panizzon <[email protected]>
Subject: [SR-Users] How to remove Reason HF from branched CANCEL?

Hi Gang

I try to remove the Reason Header from a CANCEL message.

I use parallel branching on the registrar.

The route below is called very soon in request_route.
The cancel matches as I get the log entry just before calling
remove_hf("Reason")

But the Reason HF is still present when the CANCEL is forked to the registered CPE.

The INVITE is routed through a branch_route after forking where headers can be altered per branch. But I don't see the CANCEL in the branch route.

Is there a way to alter header in a branched cancel message?

        # CANCEL processing
        if (is_method("CANCEL")) {
                if (t_check_trans()) {
                        route(FILTER_CANCEL);
                        route(RELAY);
                }
                exit;
        }

route[FILTER_CANCEL]
{
        # Buggy iPhones send wrong cancel cause code 200.
        if (is_present_hf("Reason")) {
                $var(cause) = $(hdr(Reason){param.value,cause});
                $var(text) = $(hdr(Reason){param.value,text});
                if (($var(cause) == 200) && ($var(text) == "Call Rejected By User")) {
                        if ($avp(debug) > 0) {
                                xlog("L_INFO", "$cfg(route): Remove wrong iPhone Cancel Reason HF\n"); 
                        }
                        remove_hf("Reason");
                }
        }
}


Mit freundlichen Grüssen

-Benoît Panizzon-
-- 
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