François

I think in tm mode this not possible. The CANCEL gets autogenerated by Kamailio so you can not modify it in script.

sip-router trunk has now support for Reason header, but only generating it automatically or copy it from received CANCEL.

A workaround would be to have the proxy running in stateless mode (no t_relay() but use forward()[1]) - then you can manipulate the CANCEL and then forward it.

regards
Klaus

[1] http://sip-router.org/wiki/cookbooks/core-cookbook/devel#forward

Am 20.05.2010 16:27, schrieb Alex Rendour:

Hi,
Is it possible to add an header reason in a cancel?

We receive a CANCEL without header reason and we need to forward to
another SIP proxy with the reason header?

We use this code in my conf:
if(is_method("CANCEL"))
{
if(!is_present_hf("Reason:"))
{
xlog("L_ERR", "reason missing");
append_hf("reason: Q.850; cause=31\r\n");
xlog("L_ERR", "add raison");
}

}

Thanks,

regards,

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