25 Oct
2019
25 Oct
'19
7:08 a.m.
Hello,
which of the xlog messages were printed?
Cheers,
Daniel
On 25.10.19 13:04, Lars Olsson wrote:
Hi Daniel,
Thanks for your reply.
Used the following script for testing:
if (is_method("BYE")) {
xlog("CALLID: $ci\n");
xlog("CSEQ: $cs\n");
if (t_cancel_callid("$ci", "$cs", "0")) {
xlog("Transaction cancelled\n");
} else {
xlog("Failed to cancel transaction\n");
}
send_reply("200", "OK");
exit;
}
No cancel message was triggered.
Best Regards,
Lars
------------------------------------------------------------------------
*From:* Daniel-Constantin Mierla <miconda(a)gmail.com>
*Sent:* Friday, October 25, 2019 12:32 PM
*To:* Kamailio (SER) - Users Mailing List
<sr-users(a)lists.kamailio.org>rg>; Lars Olsson <lars.olsson(a)optimobile.se>
*Subject:* Re: [SR-Users] Rewrite BYE to Cancel
Hello,
actually sending BYE for an in-progress call setup (initial INVITE
routed, but 200ok was not received yet) is valid from SIP RFC point of
view. So it is not really a broken implementation (or, not to put all
my money in, it can be, but not because of this kind of BYE).
Practically the BYE can be used to terminate a specific branch in a
call setup. Think about parallel forking, and many branches start
sending back 183. The caller UA can send BYE to some of the branches
and let the others wait to complete.
The CANCEL has to be used when all the branches should be terminated.
If there is a single branch, then the BYE terminates the call in
progress, I am not sure what the callee UA should reply to the INVITE.
On the other hand, in the very few cases when I saw UAs sending BYE
for early call setup, the other side was rejecting it, expecting the
cancel.
I expect it should work with kamailio to send 200ok for such BYE and
then use t_cancel_callid():
https://www.kamailio.org/docs/modules/stable/modules/tmx.html#tmx.f.t_cance…
The call-id and cseq values should be the same in the BYE request.
Try it and write back if works, I am quite curious about...
Cheers,
Daniel
On 25.10.19 12:17, Lars Olsson wrote:
--
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio Advanced Training, Oct 21-23, 2019, Berlin, Germany -- https://asipto.com/u/kat
Yes it is a BROKEN behavior from the remote
system, unfortunately it
can not be changed.
Besides this issue, the remote system works as it should.
A custom b2bua can for sure resolve this, but perhaps not in a
standard way.
Question is if it is possible to resolve with Kamailio or if I need
to patch SEMS to handle this.
Something like this:
if ("BYE" && dialog not confirmed)
reply back 200 OK
cancel other side of dialog
As Kamailio can terminate active dialog with sending bye in both
directions, I thought that it might be possible to resolve this as
well. Hence asking for ideas.
Best Regards,
Lars
------------------------------------------------------------------------
*From:* sr-users <sr-users-bounces(a)lists.kamailio.org>
<mailto:sr-users-bounces@lists.kamailio.org> on behalf of Steve
Davies <steve-lists-srusers(a)connection-telecom.com>
<mailto:steve-lists-srusers@connection-telecom.com>
*Sent:* Friday, October 25, 2019 11:25 AM
*To:* Kamailio (SER) - Users Mailing List
<sr-users(a)lists.kamailio.org> <mailto:sr-users@lists.kamailio.org>
*Subject:* Re: [SR-Users] Rewrite BYE to Cancel
Hi,
I'm normally a bystander. But on this occasion I've got to comment -
there are broken SIP implementations, and there are BROKEN ones.
Surely there is no hope with this one? If they can't get this right
just imagine how many more problems it will have.
Steve
On Fri, 25 Oct 2019 at 11:19, Lars Olsson <lars.olsson(a)optimobile.se
<mailto:lars.olsson@optimobile.se>> wrote:
hi,
I have a Kamailio setup infront of a SIP system that do not
handle cancellation of a INVITE correctly.
The system sends out a BYE request instead of a Cancel request on
non connected dialogs.
I am trying to find a way to let Kamailio "translate" the BYE
request to a Cancel reqeust for the ongoing INVITE dialog.
Alternative if SEMS b2bua can do it, but currently it replies:
"not sip-relaying BYE in not connected dlg", and I have not found
any obvious way to rewrite it there.
Any thoughts. I can not change the behavior of the remote system.
Best Regards,
Lars
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_______________________________________________
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--
Daniel-Constantin Mierla -- www.asipto.com <http://www.asipto.com>
www.twitter.com/miconda <http://www.twitter.com/miconda> --
www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda>
Kamailio Advanced Training, Oct 21-23, 2019, Berlin, Germany -- https://asipto.com/u/kat