26 Apr
2018
26 Apr
'18
3:25 p.m.
Hi guys,
I'm trying to setup a Call Forward No Reply with Kamailio and I've run into
this problem (that was expected):
When A INVITEs B, B replies with 183 and some SDP.
B doesn't answer so Kamailio triggers the timeout and sends the INVITE TO C.
C replies with 200 OK and some SDP, but A side drops the call as the media
session doesn't match with the expected one.
To solve it, I'm trying to send to A an UPDATE before relaying the 200 OK
from C. I tried to use UAC module (uac_req_send + $uac_req) but I don't see
how I can UPDATE the existing dialog. uac_req_send seems to try to setup a
new dialog always.
Is there a way to indicate to uac_req_send that I wan't to use the existing
dialog? Or maybe there is another mechanism I can use to send the UPDATE
inside the dialog?
Regards,
Alfonso.
26 Apr
26 Apr
5:37 p.m.
I would instead redirect my focus to why A is dropping the call in this situation. It
shouldn't be doing that.
Per the standards, the first SDP answer must be the final SDP answer (absent an update or
reinvite) *of that endpoint*. There's no rule saying that must be true of the dialog
as a whole.
-- Alex
--
Sent via mobile, please forgive typos and brevity.
6:59 p.m.
Hi Alex,
Thanks for your answer. I was thinking more or less the same, but it seems
I oversimplified the example and was missing an important point.
This is IMS, so in the middle there are a lot more in the middle. It seems
that this behaviour is normal when precondition is set and the only way to
avoid the network to release the call on A side is to send the update.
I've seen that in Kamailio 5 a new function was included in TM:
https://www.kamailio.org/docs/modules/5.1.x/modules/tm.html#tm.f.t_uac_send
In the code it looks like it's trying to use the current dialog, but that
gives me doubts about CSEQ handling on the other side.
Anyway, I will try unless someone is faster replying saying it doesn't work
:)
Thanks,
Alfonso.
On Thu, Apr 26, 2018 at 2:37 PM, Alex Balashov <abalashov(a)evaristesys.com>
wrote:
I would instead redirect my focus to why A is dropping
the call in this
situation. It shouldn't be doing that.
Per the standards, the first SDP answer must be the final SDP answer
(absent an update or reinvite) *of that endpoint*. There's no rule saying
that must be true of the dialog as a whole.
-- Alex
--
Sent via mobile, please forgive typos and brevity.
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27 Apr
27 Apr
12:39 p.m.
Hi,
likely, the best solution is here to use RTPEngine, so the IP/Port
stays identical for each request... i've tested it with various VoLTE
phones and various PCRF's.
Thanks,
Carsten
--
Carsten Bock
CEO (Geschäftsführer)
ng-voice GmbH
Millerntorplatz 1
20359 Hamburg / Germany
http://www.ng-voice.com
mailto:carsten@ng-voice.com
Office +49 40 5247593-40
Fax +49 40 5247593-99
Sitz der Gesellschaft: Hamburg
Registergericht: Amtsgericht Hamburg, HRB 120189
Geschäftsführer: Carsten Bock
Ust-ID: DE279344284
Hier finden Sie unsere handelsrechtlichen Pflichtangaben:
http://www.ng-voice.com/imprint/
2018-04-26 15:59 GMT+02:00 Alfonso Pinto <alfonso.pinto(a)gmail.com>om>:
Hi Alex,
Thanks for your answer. I was thinking more or less the same, but it seems I
oversimplified the example and was missing an important point.
This is IMS, so in the middle there are a lot more in the middle. It seems
that this behaviour is normal when precondition is set and the only way to
avoid the network to release the call on A side is to send the update.
I've seen that in Kamailio 5 a new function was included in TM:
https://www.kamailio.org/docs/modules/5.1.x/modules/tm.html#tm.f.t_uac_send
In the code it looks like it's trying to use the current dialog, but that
gives me doubts about CSEQ handling on the other side.
Anyway, I will try unless someone is faster replying saying it doesn't work
:)
Thanks,
Alfonso.
On Thu, Apr 26, 2018 at 2:37 PM, Alex Balashov <abalashov(a)evaristesys.com>
wrote:
I would instead redirect my focus to why A is dropping the call in this
situation. It shouldn't be doing that.
Per the standards, the first SDP answer must be the final SDP answer
(absent an update or reinvite) *of that endpoint*. There's no rule saying
that must be true of the dialog as a whole.
-- Alex
--
Sent via mobile, please forgive typos and brevity.
_______________________________________________
Kamailio (SER) - Users Mailing List
sr-users(a)lists.kamailio.org
https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
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30 Apr
30 Apr
2:59 p.m.
Hi Carsten,
I was thinking about the same, but I need to convince people to add another
component in the media path, they may be bit reluctant, but the idea is
great.
In the meantime, I was able to trick the phones to react how I want playing
with precondition and 100rel, for now it's acceptable in our environment.
Thanks for your answer.
Regards,
Alfonso.
On Fri, Apr 27, 2018 at 9:39 AM, Carsten Bock <carsten(a)ng-voice.com> wrote:
Hi,
likely, the best solution is here to use RTPEngine, so the IP/Port
stays identical for each request... i've tested it with various VoLTE
phones and various PCRF's.
Thanks,
Carsten
--
Carsten Bock
CEO (Geschäftsführer)
ng-voice GmbH
Millerntorplatz 1
20359 Hamburg / Germany
http://www.ng-voice.com
mailto:carsten@ng-voice.com
Office +49 40 5247593-40
Fax +49 40 5247593-99
Sitz der Gesellschaft: Hamburg
Registergericht: Amtsgericht Hamburg, HRB 120189
Geschäftsführer: Carsten Bock
Ust-ID: DE279344284
Hier finden Sie unsere handelsrechtlichen Pflichtangaben:
http://www.ng-voice.com/imprint/
2018-04-26 15:59 GMT+02:00 Alfonso Pinto <alfonso.pinto(a)gmail.com>om>:
_______________________________________________
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Hi Alex,
Thanks for your answer. I was thinking more or less the same, but it
seems I
oversimplified the example and was missing an
important point.
This is IMS, so in the middle there are a lot more in the middle. It
seems
that this behaviour is normal when precondition
is set and the only way
to
avoid the network to release the call on A side
is to send the update.
I've seen that in Kamailio 5 a new function was included in TM:
https://www.kamailio.org/docs/modules/5.1.x/modules/tm.html#
tm.f.t_uac_send
In the code it looks like it's trying to use
the current dialog, but that
gives me doubts about CSEQ handling on the other side.
Anyway, I will try unless someone is faster replying saying it doesn't
work
:)
Thanks,
Alfonso.
On Thu, Apr 26, 2018 at 2:37 PM, Alex Balashov <
abalashov(a)evaristesys.com>
wrote:
>
> I would instead redirect my focus to why A is dropping the call in this
> situation. It shouldn't be doing that.
>
> Per the standards, the first SDP answer must be the final SDP answer
> (absent an update or reinvite) *of that endpoint*. There's no rule
saying
that must
be true of the dialog as a whole.
-- Alex
--
Sent via mobile, please forgive typos and brevity.
_______________________________________________
Kamailio (SER) - Users Mailing List
sr-users(a)lists.kamailio.org
https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
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8:57 p.m.
Well, we faced the same issue of call drop when we play announcement over
183 and then handover call to B party when it come online on voip push
notification.
Telcos have more rigid systems.
Resolution was introducing B2BUA for topo-hiding in the path IMS (A party)
and VoIP service (B & C party).
Check tags of to and from headers of your call traces. That will give you
clue.
--
regards,
abdul basit | p: +92 32 1416 4196 | o: +92 30 0841 1445
On 30 April 2018 at 14:59, Alfonso Pinto <alfonso.pinto(a)gmail.com> wrote:
Hi Carsten,
I was thinking about the same, but I need to convince people to add
another component in the media path, they may be bit reluctant, but the
idea is great.
In the meantime, I was able to trick the phones to react how I want
playing with precondition and 100rel, for now it's acceptable in our
environment.
Thanks for your answer.
Regards,
Alfonso.
On Fri, Apr 27, 2018 at 9:39 AM, Carsten Bock <carsten(a)ng-voice.com>
wrote:
Hi,
likely, the best solution is here to use RTPEngine, so the IP/Port
stays identical for each request... i've tested it with various VoLTE
phones and various PCRF's.
Thanks,
Carsten
--
Carsten Bock
CEO (Geschäftsführer)
ng-voice GmbH
Millerntorplatz 1
20359 Hamburg / Germany
http://www.ng-voice.com
mailto:carsten@ng-voice.com
Office +49 40 5247593-40
Fax +49 40 5247593-99
Sitz der Gesellschaft: Hamburg
Registergericht: Amtsgericht Hamburg, HRB 120189
Geschäftsführer: Carsten Bock
Ust-ID: DE279344284
Hier finden Sie unsere handelsrechtlichen Pflichtangaben:
http://www.ng-voice.com/imprint/
2018-04-26 15:59 GMT+02:00 Alfonso Pinto <alfonso.pinto(a)gmail.com>om>:
_______________________________________________
Kamailio (SER) - Users Mailing List
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https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
Hi Alex,
Thanks for your answer. I was thinking more or less the same, but it
seems I
oversimplified the example and was missing an
important point.
This is IMS, so in the middle there are a lot more in the middle. It
seems
that this behaviour is normal when precondition
is set and the only way
to
avoid the network to release the call on A side
is to send the update.
I've seen that in Kamailio 5 a new function was included in TM:
https://www.kamailio.org/docs/modules/5.1.x/modules/tm.html#
tm.f.t_uac_send
In the code it looks like it's trying to use
the current dialog, but
that
gives me doubts about CSEQ handling on the other
side.
Anyway, I will try unless someone is faster replying saying it doesn't
work
:)
Thanks,
Alfonso.
On Thu, Apr 26, 2018 at 2:37 PM, Alex Balashov <
abalashov(a)evaristesys.com>
wrote:
>
> I would instead redirect my focus to why A is dropping the call in this
> situation. It shouldn't be doing that.
>
> Per the standards, the first SDP answer must be the final SDP answer
> (absent an update or reinvite) *of that endpoint*. There's no rule
saying
that must
be true of the dialog as a whole.
-- Alex
--
Sent via mobile, please forgive typos and brevity.
_______________________________________________
Kamailio (SER) - Users Mailing List
sr-users(a)lists.kamailio.org
https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
_______________________________________________
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sr-users(a)lists.kamailio.org
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days inactive
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5 comments
4 participants
participants (4)
-
Abdul Basit -
Alex Balashov -
Alfonso Pinto -
Carsten Bock