[SR-Users] Kamailio propagates 180 and 200 OK OUT OF ORDER
Luis Rojas G.
luis.rojas at sixbell.com
Wed Apr 8 22:32:11 CEST 2020
Hello, Henning,
No, I am not a member, and so every time I sent a message I receive the
email with :
"Your message to sr-users awaits moderator approval"
I didn't receive any confirmation email or anything at all related to my
subscription request.
Best regards,
Luis
On 4/8/20 4:20 PM, Henning Westerholt wrote:
>
> Hello Luis,
>
> I checked in the mailman checked, you seemed to be not subscribed to
> the list. Have you received the confirmation e-mail and confirmed it?
>
> This is the date and time when you tried to subscribe:
>
> Apr 07 23:08:35 2020 (15775) sr-users: pending Luis Rojas <luis dot
> rojas at sixbell dot com> 181.73.XX.XX
>
> Cheers,
>
> Henning
>
> --
>
> Henning Westerholt – https://skalatan.de/blog/
> <https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fskalatan.de%2Fblog%2F&data=02%7C01%7C%7C0b0a85d5dffe4ac00ffe08d7dbfa3bd7%7Cab4a33c2b5614f798601bc921698ad08%7C0%7C0%7C637219740126725901&sdata=Zsg4%2FKQ1DwqSKDRtU0ZYA9Cl1wjyxGHtJJdLny5zJoU%3D&reserved=0>
>
> Kamailio services – https://gilawa.com
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> *From:* Luis Rojas G. <luis.rojas at sixbell.com>
> *Sent:* Wednesday, April 8, 2020 10:04 PM
> *To:* miconda at gmail.com; Kamailio (SER) - Users Mailing List
> <sr-users at lists.kamailio.org>; Henning Westerholt <hw at skalatan.de>
> *Subject:* Re: [SR-Users] Kamailio propagates 180 and 200 OK OUT OF ORDER
>
> Hello, Daniel
>
> I will try this option.
>
> I tried the ASYNC, using async_ms_sleep, but it seems it's not allowed
> in reply_route(). I wonder why. Documentation only mentions request_route:
>
> https://kamailio.org/docs/modules/5.3.x/modules/async.html#async.f.async_ms_sleep
> <https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fkamailio.org%2Fdocs%2Fmodules%2F5.3.x%2Fmodules%2Fasync.html%23async.f.async_ms_sleep&data=02%7C01%7C%7C0b0a85d5dffe4ac00ffe08d7dbfa3bd7%7Cab4a33c2b5614f798601bc921698ad08%7C0%7C0%7C637219740126735897&sdata=R8gNq1GqEJe75SCvTO%2FFCbPZKGxhIHX2sSgsheoaxcg%3D&reserved=0>
>
> if I use it in reply_route() kamailio does not even start.
>
> 0(22147) ERROR: <core> [core/cfg.y:3402]: yyparse(): misused command
> async_ms_sleep
> 0(22147) CRITICAL: <core> [core/cfg.y:3547]: yyerror_at(): parse
> error in config file /etc/kamailio/kamailio.cfg, line 221, column 23:
> Command cannot be used in the block
>
> ERROR: bad config file (1 errors)
>
> I wanted to introduce an artificial delay of just a few miliseconds to
> 200 OK to INVITE.
>
> it's not just a problem about 180 and 200, but several other
> conditions that will start to appear, like betwen ACK-Reinvite.
>
> Anyone reading is the list administrator? I tried to subscribe to the
> list, bit it seems I am still not a member, so I don't receive answers
> (unless I am copied directly) and can't post immediately, only after
> moderator's approval.
>
> Also, I can't answer all responses.
>
> Best regards,
>
> Luis
>
> On 4/8/20 1:07 PM, Daniel-Constantin Mierla wrote:
>
> Hello,
>
> you have to keep in mind that Kamailio is a SIP packet router, not
> a telephony engine. If 180 and 200 replies are part of a call is
> not something that Kamailio recognize at its core. Its main goal
> is to route out as fast as possible what is received, by executing
> the configuration file script. Now, a matter of your configuration
> file, processing of some SIP messages can take longer than
> processing other. And the processing is done in parallel, a matter
> of children parameter (and tcp_children, sctp_children).
>
> With that in mind, a way to try to cope better with the issue you
> face is to set route_locks_size parameter, see:
>
> *
> https://www.kamailio.org/wiki/cookbooks/devel/core#route_locks_size
> <https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.kamailio.org%2Fwiki%2Fcookbooks%2Fdevel%2Fcore%23route_locks_size&data=02%7C01%7C%7C0b0a85d5dffe4ac00ffe08d7dbfa3bd7%7Cab4a33c2b5614f798601bc921698ad08%7C0%7C0%7C637219740126745899&sdata=2rvJhQuycna8JLMYrsl4CRHY3eYD6mk75OidAQvZjqY%3D&reserved=0>
>
> Probably is what you look for.
>
> But if you want more tight constraints, like when receiving a 180
> after a 200ok and not route it out, you have to make the logic in
> configuration file by combining modules such as dialog or htable
> (as already suggested).
>
> Cheers,
> Daniel
>
> On 08.04.20 16:04, Luis Rojas G. wrote:
>
> Hi, Henning,
>
> No need to be ironic. As I mentioned on my first post, I tried
> stateful proxy and I observed the same behavior.
>
> /"I tried using stateful proxy and I obtained the same result."/
>
> The asynchronous sleep seems promising. I will look into it.
>
> Thanks,
>
> Luis
>
>
> On 4/8/20 9:30 AM, Henning Westerholt wrote:
>
> Hi Luis,
>
> I see. Well, you want to use Kamailio as a stateless
> proxy, on the other hand it should do things that are
> inherently stateful. 😉
>
> As mentioned, have a look to the dialog module to track
> the state of dialogs that you process. This will not work
> in a stateless mode, though.
>
> You can also use the htable module to just store some data
> about the processed messages in a shared memory table and
> use this to enforce your ordering. There is also the
> option to do an asynchronous sleep (with the async) module
> on the message that you want to delay but still processing
> other messages during it.
>
> Cheers,
>
> Henning
>
> --
>
> Henning Westerholt – https://skalatan.de/blog/
> <https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fskalatan.de%2Fblog%2F&data=02%7C01%7C%7C0b0a85d5dffe4ac00ffe08d7dbfa3bd7%7Cab4a33c2b5614f798601bc921698ad08%7C0%7C0%7C637219740126755895&sdata=sTgS3OE42QH2V75%2FJGHejT1Q%2BKyx1oOCozcNUhdGPe8%3D&reserved=0>
>
> Kamailio services – https://gilawa.com
> <https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgilawa.com%2F&data=02%7C01%7C%7C0b0a85d5dffe4ac00ffe08d7dbfa3bd7%7Cab4a33c2b5614f798601bc921698ad08%7C0%7C0%7C637219740126755895&sdata=kgTIj%2FQHNV84x5ez8r8SN%2BOCzXz0pMQjdLpLiJ4%2Btvc%3D&reserved=0>
>
>
> *From:* Luis Rojas G. <luis.rojas at sixbell.com>
> <mailto:luis.rojas at sixbell.com>
> *Sent:* Wednesday, April 8, 2020 3:00 PM
> *To:* Henning Westerholt <hw at skalatan.de>
> <mailto:hw at skalatan.de>; Kamailio (SER) - Users Mailing
> List <sr-users at lists.kamailio.org>
> <mailto:sr-users at lists.kamailio.org>
> *Subject:* Re: [SR-Users] Kamailio propagates 180 and 200
> OK OUT OF ORDER
>
> Hello, Henning,
>
> I am worried about this scenario, because it's a symptom
> of what may happen in other cases. For instance, I've seen
> that this operator usually sends re-invites immediate
> after sending ACK. This may create race conditions like
> 3.1.5 of RFC5407
>
> https://tools.ietf.org/html/rfc5407#page-22
> <https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftools.ietf.org%2Fhtml%2Frfc5407%23page-22&data=02%7C01%7C%7C0b0a85d5dffe4ac00ffe08d7dbfa3bd7%7Cab4a33c2b5614f798601bc921698ad08%7C0%7C0%7C637219740126765886&sdata=fWW3S%2FmlzcitCl2ocmzoHQXY2P%2BK%2BSYqNTM3yLTqX6A%3D&reserved=0>
>
> I'd understand that one happens because of packet loss, as
> it's in UDP's nature, but in this case it would be
> artificially created by Kamailio. if there was no problem
> at network level (packet loss, packets following different
> path on the network and arriving out of order), why
> Kamailio creates it?
>
> I'd expect that the shared memory is used precisely for
> this. If an instance of kamailio receives a 200 OK, it
> could check on the shm and say "hey, another instance is
> processing a 180 for this call. Let's wait for it to
> finish" (*). I know there could still be a problem, the
> instance processing the 180 undergoes a context switch
> just after it receives the message, but before writing to
> shm, but it would greatly reduce the chance.
>
> In our applications we use a SIP stack that always sends
> messages to the application in the same order it receives
> them, even though is multi-threaded and messages from the
> network are received by different threads. So, they really
> syncronize between them. Why Kamailio instances don't?
>
> I am evaluating kamailio to use it as a dispatcher to
> balance load against our several Application Servers, to
> present to the operator just a couple of entrance points
> to our platform (they don't want to establish connections
> to each one of our servers). This operator is very
> difficult to deal with. I am sure they will complain
> something like "why are you sending messages out of order?
> Fix that". The operator will be able to see traces and
> check that messages entered the Kamailio nodes in order
> and left out of order. They will not accept it.
>
> (*) Not really "wait", as it would introduce a delay in
> processing all messages. it should be like putting it on a
> queue, continue processing other messages, and go back to
> the queue later.
>
> Well, thanks for your answer.
>
> Luis
>
>
>
>
> On 4/8/20 3:01 AM, Henning Westerholt wrote:
>
> Hello Luis,
>
> as the 1xx responses are usually send unreliable
> (unless you use PRACK), you should not make any
> assumption on the order or even the arrival of this
> messages. It can also happens on a network level, if
> send by UDP.
>
> Can you elaborate why you think this re-ordering is a
> problem for you?
>
> One idea to enforce some ordering would be to use the
> dialog module in combination with reply routes and the
> textops(x) module.
>
> About the shared memory question – Kamailio implement
> its own memory manager (private memory and shared
> memory pool).
>
> Cheers,
>
> Henning
>
> --
>
> Henning Westerholt – https://skalatan.de/blog/
> <https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fskalatan.de%2Fblog%2F&data=02%7C01%7C%7C0b0a85d5dffe4ac00ffe08d7dbfa3bd7%7Cab4a33c2b5614f798601bc921698ad08%7C0%7C0%7C637219740126775887&sdata=6Ta8j%2FmwY4sj%2FJuJYf3BmOjoLc0GqB3RoJsQkwjX9fE%3D&reserved=0>
>
> Kamailio services – https://gilawa.com
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>
> *From:* sr-users <sr-users-bounces at lists.kamailio.org>
> <mailto:sr-users-bounces at lists.kamailio.org> *On
> Behalf Of *Luis Rojas G.
> *Sent:* Tuesday, April 7, 2020 10:43 PM
> *To:* sr-users at lists.kamailio.org
> <mailto:sr-users at lists.kamailio.org>
> *Subject:* [SR-Users] Kamailio propagates 180 and 200
> OK OUT OF ORDER
>
> Good day,
>
> I am testing the dispatcher module, using Kamailio as
> stateless proxy. I have a pool of UAC (scripts in
> SIPP) and a pool of UAS (also scripts in SIPP) for the
> destinations. Kamailio version is
> kamailio-5.3.3-4.1.x86_64.
>
> Problem I have is, if UAS responds 180 and 200 OK to
> Invite immediately, sometimes they are propagated out
> of order. 200 OK before 180, like this :
>
> UAS is 172.30.4.195:5061. UAC is 172.30.4.195:5080.
> Kamailio is 192.168.253.4:5070
>
> Difference between 180 and 200 is just about 50
> microseconds.
>
> My guess is that both messages are received by
> different instances of Kamailio, and then because of
> context switches, even though the 180 is received
> before, that process ends after the processing of 200.
> However, I had the idea that in order to avoid these
> problems the kamailio processes synchronized with each
> other using a shared memory. I tried using stateful
> proxy and I obtained the same result.
>
> By the way, anyone has any idea about how Kamailio's
> share memory is implemented? It clearly does not use
> the typical system calls shmget(), shmat(), because
> they are not shown by ipcs command.
>
> Before posting here I googled, but I couldn't find
> anything related to this. I can't believe I am the
> only one who ever had this problem, so I guess I am
> doing something wrong...
>
> Please, any help. I'm really stuck on this.
>
> Thanks.
>
> --
>
> --
>
> Luis Rojas
>
> Software Architect
>
> Sixbell
>
> Los Leones 1200
>
> Providencia
>
> Santiago, Chile
>
> Phone: (+56-2) 22001288
>
> mailto:luis.rojas at sixbell.com
>
> http://www.sixbell.com <https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.sixbell.com%2F&data=02%7C01%7C%7C0b0a85d5dffe4ac00ffe08d7dbfa3bd7%7Cab4a33c2b5614f798601bc921698ad08%7C0%7C0%7C637219740126785882&sdata=b3ZCPZYFoj3MK5yvYyC%2BmaA4TaX79XK6kMgcpKfKeHU%3D&reserved=0>
>
> --
>
> Luis Rojas
>
> Software Architect
>
> Sixbell
>
> Los Leones 1200
>
> Providencia
>
> Santiago, Chile
>
> Phone: (+56-2) 22001288
>
> mailto:luis.rojas at sixbell.com
>
> http://www.sixbell.com <https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.sixbell.com%2F&data=02%7C01%7C%7C0b0a85d5dffe4ac00ffe08d7dbfa3bd7%7Cab4a33c2b5614f798601bc921698ad08%7C0%7C0%7C637219740126785882&sdata=b3ZCPZYFoj3MK5yvYyC%2BmaA4TaX79XK6kMgcpKfKeHU%3D&reserved=0>
>
>
>
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>
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> --
>
> Daniel-Constantin Mierla --www.asipto.com <https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.asipto.com%2F&data=02%7C01%7C%7C0b0a85d5dffe4ac00ffe08d7dbfa3bd7%7Cab4a33c2b5614f798601bc921698ad08%7C0%7C0%7C637219740126805873&sdata=HP7Zo8iF2agQH5hsn8MszA4yvqaBrEmWokb82inWai4%3D&reserved=0>
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>
> --
> Luis Rojas
> Software Architect
> Sixbell
> Los Leones 1200
> Providencia
> Santiago, Chile
> Phone: (+56-2) 22001288
> mailto:luis.rojas at sixbell.com
> http://www.sixbell.com <https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.sixbell.com%2F&data=02%7C01%7C%7C0b0a85d5dffe4ac00ffe08d7dbfa3bd7%7Cab4a33c2b5614f798601bc921698ad08%7C0%7C0%7C637219740126825866&sdata=Eue1NN0hWvVc%2BECank%2F6ZomNe2YitlpGQtpCmmSWA6U%3D&reserved=0>
--
Luis Rojas
Software Architect
Sixbell
Los Leones 1200
Providencia
Santiago, Chile
Phone: (+56-2) 22001288
mailto:luis.rojas at sixbell.com
http://www.sixbell.com
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