[SR-Users] Wrong "To" header in CANCEL, when "To" has been rewritten by uac_replace_to() in branch route

Julia juliabo at gmail.com
Thu Nov 7 10:39:54 CET 2013

Hello Daniel,


Version 3.3.5,

We use uac_replace_to() in branch route and without patch the "To" in local
CANCEL is taken from original INVITE.


Thank you,




From: sr-users-bounces at lists.sip-router.org
[mailto:sr-users-bounces at lists.sip-router.org] On Behalf Of
Daniel-Constantin Mierla
Sent: Thursday, November 07, 2013 11:30 AM
To: Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] Wrong "To" header in CANCEL, when "To" has been
rewritten by uac_replace_to() in branch route



what version do you have and what function is used to change the To header?

If you use uac_replace_to() with latest stable version, the new To header
should be used for local CANCEL and ACK.


On 11/7/13 9:31 AM, Julia wrote:



I know it was already discussed, that not recommended to modify "To" header
and no routing should ever be done on "To".

But as long as there are carriers that do it, we need full support for this
manipulation for all messages in the call flow.


I found in list a few mails with the same problem of wrong header "To" in
CANCEL after "To" rewriting.

And one solution from Vitaliy Aleksandrov :


"Kamailio builds "To" header from the received INVITE.
Patch to fix it:
--- ./kamailio-3.2.3/modules/tm/t_cancel.c      2012-08-22 
10:39:21.000000000 +0300
+++ ./kamailio-3.2.3-fixed/modules/tm/t_cancel.c       2012-10-01 
18:25:57.000000000 +0300
@@ -284,7 +284,7 @@
         if (cfg_get(tm, tm_cfg, reparse_invite)) {
                 /* build the CANCEL from the INVITE which was sent out */
                 cancel = build_local_reparse(t, branch, &len, CANCEL, 
- &t->to
+                                                                       NULL
         #endif /* CANCEL_REASON_SUPPORT */"
We use header "To" manipulation in branch route (after failure route) and
this patch solved our problem with "To" in CANCEL.
But a patch is not committed.
Is it possible to commit this solution?
Thank you,


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