Hello,

there is a tm module that allows setting extra parameters for local ACK and CANCEL:

- http://kamailio.org/docs/modules/stable/modules/tm.html#ac_extra_hdrs

But I think it doesn't support variables -- only static string -- but you can give it a try.

I had in my to-do for a while to add an event route for local ack/cancel where to allow adding headers, but it was no time for it. Maybe you can open a feature request on tracker so it gets higher priority and eventually other devs will look at it.

Cheers,
Daniel

On 11/20/13 3:53 PM, Grant Bagdasarian wrote:
No, it has to be done in Kamailio. And since there is no way to append a header 
to a CANCEL, I'm forced to do it another way.
I did notice after the CANCEL is sent by the UAC, the UAS generates a 487 
Request Terminated. I'm able to append a header to the 487.
So, that does solve my problem.

-----Original Message-----
From: sr-users-boun...@lists.sip-router.org 
[mailto:sr-users-boun...@lists.sip-router.org] On Behalf Of Alex Balashov
Sent: Wednesday, November 20, 2013 3:28 PM
To: sr-users@lists.sip-router.org
Subject: Re: [SR-Users] append_hf to CANCEL

On 11/20/2013 09:26 AM, Grant Bagdasarian wrote:

I want to know when the CANCEL was received by Kamailio, and update
the datetime column of the row created by the initial INVITE. It's a
custom thing.
What stops you from doing this now?  Or do you mean you need to do it on the 
upstream (and presumably non-Kamailian) UAS?

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