27 Aug
2021
27 Aug
'21
5:18 a.m.
Hello,
following situation.
I have a Kamailio (5.4) using rtpengine to loadbalance calls.
If a call from Alice comes in, Kamailio decides to send the call to Carrier
B from Bob.
Bobs Phone is ringing and the carrier B send a 183 Session Progress with
SDP and To-tag=abcd. The SDP has G722 as codec and port 1234.
A few moments later carrier B send a second 183 Session Progress with SDP
and TO-tag=fghi. The SDP has G711 as codec and port 5678. This is done, to
play some funky music as ringtone -.-
If Bob answers the call, carrier B sends a 200 OK WITHOUT SDP and
TO-tag=abcd. So this should instruct our Kamailio to switch to the first
G722 and port 1234.
But sadly, this is just not working as expected.
We tried to set the flags media-handover and port-latching for the
rtpengine options and additionally set a to-tag when using rtpenging_manage.
But this doesn't solve the codec change, so we have only audio when Bob
answers the call, but no ringtone-music. If we allow G711 only in the
outgoing INVITE to Bob, we have also tha ringtone-muisic, because there is
no codec-change.
Carrier B tells us, they are using a fork-mechanism.
Is there something we can do, to support the codec change in 183? Or
enforce carrier B to send SDP in 200 OK? Or anything else?
Carrier B can not change anything in the ringtone-music-backend. They are
stuck on G711.
Thanks!
27 Aug
27 Aug
5:45 a.m.
Hello.
The first thing: to tag can't be changed due session once it passed.
If provider uses forking mechanism the it has to be hidden from your
system.
Regarding SDP according
https://datatracker.ietf.org/doc/html/rfc3261#section-13.2.1
They can't change SDP answer description on the fly. Only first SDP answer
used as proper, all othe answers will be ignored.
On Fri, 27 Aug 2021, 11:27 B. Tietz, <benjamin.tietz(a)berlin.de> wrote:
Hello,
following situation.
I have a Kamailio (5.4) using rtpengine to loadbalance calls.
If a call from Alice comes in, Kamailio decides to send the call to
Carrier B from Bob.
Bobs Phone is ringing and the carrier B send a 183 Session Progress with
SDP and To-tag=abcd. The SDP has G722 as codec and port 1234.
A few moments later carrier B send a second 183 Session Progress with SDP
and TO-tag=fghi. The SDP has G711 as codec and port 5678. This is done, to
play some funky music as ringtone -.-
If Bob answers the call, carrier B sends a 200 OK WITHOUT SDP and
TO-tag=abcd. So this should instruct our Kamailio to switch to the first
G722 and port 1234.
But sadly, this is just not working as expected.
We tried to set the flags media-handover and port-latching for the
rtpengine options and additionally set a to-tag when using rtpenging_manage.
But this doesn't solve the codec change, so we have only audio when Bob
answers the call, but no ringtone-music. If we allow G711 only in the
outgoing INVITE to Bob, we have also tha ringtone-muisic, because there is
no codec-change.
Carrier B tells us, they are using a fork-mechanism.
Is there something we can do, to support the codec change in 183? Or
enforce carrier B to send SDP in 200 OK? Or anything else?
Carrier B can not change anything in the ringtone-music-backend. They are
stuck on G711.
Thanks!
__________________________________________________________
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7:16 a.m.
it's legal to get responses with different to-tags, since the request is
forked. this is what's happening in this scenario.
I think this is an issue of UAC/rtpengin how it is reacting to the second
SDP in 183
are the SDPs in 183 responses carried reliably?
On Fri, Aug 27, 2021 at 2:51 PM Yuriy Gorlichenko <ovoshlook(a)gmail.com>
wrote:
Hello.
The first thing: to tag can't be changed due session once it passed.
If provider uses forking mechanism the it has to be hidden from your
system.
Regarding SDP according
https://datatracker.ietf.org/doc/html/rfc3261#section-13.2.1
They can't change SDP answer description on the fly. Only first SDP answer
used as proper, all othe answers will be ignored.
On Fri, 27 Aug 2021, 11:27 B. Tietz, <benjamin.tietz(a)berlin.de> wrote:
--
Arsen Semenov
Hello,
following situation.
I have a Kamailio (5.4) using rtpengine to loadbalance calls.
If a call from Alice comes in, Kamailio decides to send the call to
Carrier B from Bob.
Bobs Phone is ringing and the carrier B send a 183 Session Progress with
SDP and To-tag=abcd. The SDP has G722 as codec and port 1234.
A few moments later carrier B send a second 183 Session Progress with SDP
and TO-tag=fghi. The SDP has G711 as codec and port 5678. This is done, to
play some funky music as ringtone -.-
If Bob answers the call, carrier B sends a 200 OK WITHOUT SDP and
TO-tag=abcd. So this should instruct our Kamailio to switch to the first
G722 and port 1234.
But sadly, this is just not working as expected.
We tried to set the flags media-handover and port-latching for the
rtpengine options and additionally set a to-tag when using rtpenging_manage.
But this doesn't solve the codec change, so we have only audio when Bob
answers the call, but no ringtone-music. If we allow G711 only in the
outgoing INVITE to Bob, we have also tha ringtone-muisic, because there is
no codec-change.
Carrier B tells us, they are using a fork-mechanism.
Is there something we can do, to support the codec change in 183? Or
enforce carrier B to send SDP in 200 OK? Or anything else?
Carrier B can not change anything in the ringtone-music-backend. They are
stuck on G711.
Thanks!
__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions
* sr-users(a)lists.kamailio.org
Important: keep the mailing list in the recipients, do not reply only to
the sender!
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__________________________________________________________
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* sr-users(a)lists.kamailio.org
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7:36 a.m.
Hi,
I faced a quite same situation recently and I have asked on RTPEngine Github:
https://github.com/sipwise/rtpengine/issues/1330
Your scenario is a bit different but with the workaround described in the issue
(overriding to-tag flag in rtpengine request), maybe you can fix your issue.
Just also be careful when either Alice or Bob sends ReInvites within the call, to-tag (or
from-tag depending on who sent the request) will need to be overridden too.
Julien
De : sr-users <sr-users-bounces(a)lists.kamailio.org> au nom de Arsen Semenov
<arsperger(a)gmail.com>
Répondre à : "Kamailio (SER) - Users Mailing List"
<sr-users(a)lists.kamailio.org>
Date : vendredi 27 août 2021 à 07:28
À : "Kamailio (SER) - Users Mailing List" <sr-users(a)lists.kamailio.org>
Objet : Re: [SR-Users] Manage multiple RTP streams with different TO-tags (forking)
it's legal to get responses with different to-tags, since the request is forked. this
is what's happening in this scenario.
I think this is an issue of UAC/rtpengin how it is reacting to the second SDP in 183
are the SDPs in 183 responses carried reliably?
On Fri, Aug 27, 2021 at 2:51 PM Yuriy Gorlichenko
<ovoshlook@gmail.com<mailto:ovoshlook@gmail.com>> wrote:
Hello.
The first thing: to tag can't be changed due session once it passed.
If provider uses forking mechanism the it has to be hidden from your system.
Regarding SDP according
https://datatracker.ietf.org/doc/html/rfc3261#section-13.2.1
They can't change SDP answer description on the fly. Only first SDP answer used as
proper, all othe answers will be ignored.
On Fri, 27 Aug 2021, 11:27 B. Tietz,
<benjamin.tietz@berlin.de<mailto:benjamin.tietz@berlin.de>> wrote:
Hello,
following situation.
I have a Kamailio (5.4) using rtpengine to loadbalance calls.
If a call from Alice comes in, Kamailio decides to send the call to Carrier B from Bob.
Bobs Phone is ringing and the carrier B send a 183 Session Progress with SDP and
To-tag=abcd. The SDP has G722 as codec and port 1234.
A few moments later carrier B send a second 183 Session Progress with SDP and TO-tag=fghi.
The SDP has G711 as codec and port 5678. This is done, to play some funky music as
ringtone -.-
If Bob answers the call, carrier B sends a 200 OK WITHOUT SDP and TO-tag=abcd. So this
should instruct our Kamailio to switch to the first G722 and port 1234.
But sadly, this is just not working as expected.
We tried to set the flags media-handover and port-latching for the rtpengine options and
additionally set a to-tag when using rtpenging_manage.
But this doesn't solve the codec change, so we have only audio when Bob answers the
call, but no ringtone-music. If we allow G711 only in the outgoing INVITE to Bob, we have
also tha ringtone-muisic, because there is no codec-change.
Carrier B tells us, they are using a fork-mechanism.
Is there something we can do, to support the codec change in 183? Or enforce carrier B to
send SDP in 200 OK? Or anything else?
Carrier B can not change anything in the ringtone-music-backend. They are stuck on G711.
Thanks!
__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions
* sr-users@lists.kamailio.org<mailto:sr-users@lists.kamailio.org>
Important: keep the mailing list in the recipients, do not reply only to the sender!
Edit mailing list options or unsubscribe:
* https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions
* sr-users@lists.kamailio.org<mailto:sr-users@lists.kamailio.org>
Important: keep the mailing list in the recipients, do not reply only to the sender!
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--
Arsen Semenov
7 Sep
7 Sep
2:14 a.m.
I did have a very similar problem and it got solved by using the
via-branch=auto in the rtpengine offer....
Check the comments here:
https://github.com/sipwise/rtpengine/commit/23977237c0753c9877b082d71d45348…
On Fri, 27 Aug 2021 at 21:40, Julien Klingenmeyer <
julien.klingenmeyer(a)ovhcloud.com> wrote:
Hi,
I faced a quite same situation recently and I have asked on RTPEngine
Github: https://github.com/sipwise/rtpengine/issues/1330
Your scenario is a bit different but with the workaround described in the
issue (overriding to-tag flag in rtpengine request), maybe you can fix your
issue.
Just also be careful when either Alice or Bob sends ReInvites within the
call, to-tag (or from-tag depending on who sent the request) will need to
be overridden too.
Julien
*De : *sr-users <sr-users-bounces(a)lists.kamailio.org> au nom de Arsen
Semenov <arsperger(a)gmail.com>
*Répondre à : *"Kamailio (SER) - Users Mailing List" <
sr-users(a)lists.kamailio.org>
*Date : *vendredi 27 août 2021 à 07:28
*À : *"Kamailio (SER) - Users Mailing List"
<sr-users(a)lists.kamailio.org>
*Objet : *Re: [SR-Users] Manage multiple RTP streams with different
TO-tags (forking)
it's legal to get responses with different to-tags, since the request is
forked. this is what's happening in this scenario.
I think this is an issue of UAC/rtpengin how it is reacting to the second
SDP in 183
are the SDPs in 183 responses carried reliably?
On Fri, Aug 27, 2021 at 2:51 PM Yuriy Gorlichenko <ovoshlook(a)gmail.com>
wrote:
Hello.
The first thing: to tag can't be changed due session once it passed.
If provider uses forking mechanism the it has to be hidden from your
system.
Regarding SDP according
https://datatracker.ietf.org/doc/html/rfc3261#section-13.2.1
They can't change SDP answer description on the fly. Only first SDP answer
used as proper, all othe answers will be ignored.
On Fri, 27 Aug 2021, 11:27 B. Tietz, <benjamin.tietz(a)berlin.de> wrote:
Hello,
following situation.
I have a Kamailio (5.4) using rtpengine to loadbalance calls.
If a call from Alice comes in, Kamailio decides to send the call to
Carrier B from Bob.
Bobs Phone is ringing and the carrier B send a 183 Session Progress with
SDP and To-tag=abcd. The SDP has G722 as codec and port 1234.
A few moments later carrier B send a second 183 Session Progress with SDP
and TO-tag=fghi. The SDP has G711 as codec and port 5678. This is done, to
play some funky music as ringtone -.-
If Bob answers the call, carrier B sends a 200 OK WITHOUT SDP and
TO-tag=abcd. So this should instruct our Kamailio to switch to the first
G722 and port 1234.
But sadly, this is just not working as expected.
We tried to set the flags media-handover and port-latching for the
rtpengine options and additionally set a to-tag when using rtpenging_manage.
But this doesn't solve the codec change, so we have only audio when Bob
answers the call, but no ringtone-music. If we allow G711 only in the
outgoing INVITE to Bob, we have also tha ringtone-muisic, because there is
no codec-change.
Carrier B tells us, they are using a fork-mechanism.
Is there something we can do, to support the codec change in 183? Or
enforce carrier B to send SDP in 200 OK? Or anything else?
Carrier B can not change anything in the ringtone-music-backend. They are
stuck on G711.
Thanks!
__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions
* sr-users(a)lists.kamailio.org
Important: keep the mailing list in the recipients, do not reply only to
the sender!
Edit mailing list options or unsubscribe:
* https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
__________________________________________________________
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* sr-users(a)lists.kamailio.org
Important: keep the mailing list in the recipients, do not reply only to
the sender!
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--
Arsen Semenov
__________________________________________________________
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993
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1004
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4 comments
5 participants
participants (5)
-
Arsen Semenov -
B. Tietz -
Julien Klingenmeyer -
Patrick Wakano -
Yuriy Gorlichenko