[SR-Users] Kamailio OPTIONS Round-Trip

Wed Feb 19 21:55:24 CET 2020

+1 here. This feature would be a BIG plus. I’m also interested in what Nuno
pointed out, how is it decided which registrar will send the OPTIONS to the
UAC if we have multiple registrars sharing contacts via DMQ?

On Wed, 19 Feb 2020 at 20:18, Joel Serrano <joel at textplus.com> wrote:

> Just for future reference:
>
> https://github.com/kamailio/kamailio/issues/2223
>
> On Tue, Apr 30, 2019 at 3:27 AM Rhys Hanrahan <rhys at nexusone.com.au>
> wrote:
>
>> Hi Everyone,
>>
>>
>>
>> I would just like to add that I’m also very interested in several of the
>> things Daniel mentioned in this thread. Particularly the RTT/latency
>> information for NAT’d contacts is very useful – so that’s a +1 from me.
>>
>>
>>
>> As someone who is trying to migrate from using Asterisk as our registrar,
>> to using Kamailio, there’s several things Asterisk does with this info that
>> our support team relies on heavily for day to day operations/support, and I
>> need to find a way to replicate this behaviour.
>>
>>
>>
>> As an example of how we use this:
>>
>>
>>
>>    - Asterisk will log when SIP endpoints become lagged or unreachable
>>    based on the OPTIONS RTT – so you can set a threshold and if a device takes
>>    too long to respond, Asterisk will log that it first Lagged, then
>>    Unreachable.
>>    - Asterisk will then log when a handset comes back online showing it
>>    as “Reachable”.
>>
>>
>>
>> This is a really handy way of historically trying to diagnose call drop
>> outs or call quality issues, as you can quickly see with a few greps of
>> syslog if all handsets at a particular IP at a particular time are dropping
>> out at the same time, or not. While the goal would be to have proper
>> monitoring of a customer’s internet connection, this can’t always be done.
>> And having access to the latency on these NAT ping packets is extremely
>> helpful in this case. Even with internet monitoring, having stats “per
>> handset” is very useful.
>>
>>
>>
>> Not everyone would want to spam their logs with this info – but having
>> access to the RTT information so you can decide what to do with it in your
>> config is critical in my opinion.
>>
>>
>>
>> I was not aware of the UDP limitation of nathelper, but that explains
>> some issues I saw, and that’s going to be an issue for us as well.
>>
>>
>>
>> So I would be very keen to see the features discussed further. I am
>> trying to learn C at the moment so hopefully I can assist in some way in
>> future as well. :-)
>>
>>
>>
>> Thanks,
>>
>> Rhys.
>>
>>
>>
>> *From: *sr-users <sr-users-bounces at lists.kamailio.org> on behalf of Nuno
>> Ferreira <nferreira at fuze.com>
>> *Reply-To: *"Kamailio (SER) - Users Mailing List" <
>> sr-users at lists.kamailio.org>
>> *Date: *Tuesday, 5 February 2019 at 1:37 am
>> *To: *"Kamailio (SER) - Users Mailing List" <sr-users at lists.kamailio.org>
>> *Subject: *Re: [SR-Users] Kamailio OPTIONS Round-Trip
>>
>>
>>
>> Hey there,
>>
>>
>>
>> Just trying to see if there was any conclusion on this topic...
>>
>>
>>
>> Thanks
>>
>>
>>
>> On Wed, Jan 16, 2019 at 3:18 PM Sergiu Pojoga <pojogas at gmail.com> wrote:
>>
>> After re-reading the original question, it appears that it isn't about
>> Asterisk at all, it was a simple reference to it, the actual question being
>> how to get RTT in Kamailios's usloc.
>>
>>
>>
>> Apologies for the confusion. Let's carry on with the topic, lol.
>>
>>
>>
>> Cheers,
>>
>> --Sergiu
>>
>>
>>
>> On Wed, Jan 16, 2019 at 9:55 AM Sergiu Pojoga <pojogas at gmail.com> wrote:
>>
>> Correct me if I'm wrong, but wasn't the original poster looking for
>> Asterisk (behind Kamailio) to show the round-trip of its peers based on
>> qualify OPTIONS requests that Asterisk sends out to the peer?
>>
>>
>>
>> If so, I'm curious what is the impediment not to accept the previously
>> suggested sip PATH approach? Aside from elegance and simplicity to
>> implement, it isn't even subject to the UDP limitation you've brought up.
>>
>>
>>
>> Not that the topic of usrloc qualify isn't of interest, but it just feels
>> like we are drifting into another topic, although somehow related to the
>> original one.
>>
>>
>>
>> Best regards,
>>
>> --Sergiu
>>
>>
>>
>> On Wed, Jan 16, 2019 at 7:59 AM Nuno Ferreira <nferreira at fuze.com> wrote:
>>
>> Hello Daniel,
>>
>>
>>
>> I'm reading this thread with some interests. We were planning to use
>> nat_traversal module to do keepalive, but we came across the UDP only
>> limitation. In our use case, we wanted to offload the registrar from doing
>> keepalive. Of course, that's an option, but it has yet another limitation
>> when having active/active registrar servers using dmq_usrloc. If one of the
>> registrars goes down which server will be in charge of doing keepalive for
>> the contacts previously registered on the faulty registrar? That was one of
>> the reasons for us to seek doing keeplive on the edge with nat_traversal,
>> but again it's only valid for UDP.
>>
>> If usrloc/dmq_usrloc provides some automatic election mechanism to
>> keepalive orphan AORs, I would prefer going with it for the task. Another
>> benefit like I read from your words is that we would automatically have
>> available latency/rtt attached to each contact and that is a big plus.
>>
>>
>>
>> Regards,
>>
>>
>>
>> Nuno
>>
>>
>>
>> On Wed, Jan 16, 2019 at 12:26 PM Daniel-Constantin Mierla <
>> miconda at gmail.com> wrote:
>>
>> Hello,
>>
>> maybe we can just add this feature to the usrloc module -- right now the
>> nat keepalive is done from nathelper module, which queries usrloc module to
>> retrieve the list of the contacts to send OPTIONS to. Of course, the
>> nathelper has the other variant witj 4-bytes pings, but I expect not many
>> are using it these days.
>>
>> Furthermore, because the nathelper has some options to forge the source
>> ip address as well as willing to be lightweight, it sends the packets
>> directly, no relying on tm module.
>>
>> However, it seems that it is an increase interest in having more feedback
>> based on these keepalives. Including the ability to do mirroring for
>> sipcapture (a feature request being open in the tracker). Other request in
>> the past was to send OPTIONS also for non-UDP contacts, nathelper does it
>> only for UDP.
>>
>> So we can consider adding a transaction based keepalive layer, which of
>> course might take a bit more resources that current nathelper
>> implementation, but can bring extra benefits. I think we can leave
>> nathelper as it is and add this feature directly in the usrloc module,
>> avoiding to pass data between modules, but also because we have to
>> set/updates some fields in the contract structure (like this round trip
>> time).
>>
>> There are other modules that do keepalive, some mentioned dispatcher,
>> there is a dedicated one named keepalive, and, afaik, also nat_traversal
>> can do it. I am listing them so others can assert where it would be better
>> to add the new feature -- as said, I would do it in usrloc, but I am open
>> for other suggestions as well (eventually accompanied with a pull request).
>>
>> Cheers,
>> Daniel
>>
>> On 15.01.19 21:12, Julien Chavanton wrote:
>>
>> Depending on the use case, you could use the dispatcher module latency
>> stats.
>>
>>
>>
>>
>> https://kamailio.org/docs/modules/devel/modules/dispatcher.html#dispatcher.p.ds_ping_latency_stats
>>
>>
>>
>> Regards
>>
>>
>>
>> On Tue, Jan 15, 2019 at 2:29 AM Daniel Tryba <d.tryba at pocos.nl> wrote:
>>
>> On Sun, Jan 13, 2019 at 10:08:31PM +0300, Soltanici Ilie wrote:
>> > With Asterisk, we are able to get some peer round-trip connection
>> statistic by setting qualify=yes for the specified peer.
>> > It sends periodic OPTIONS to the peer and calculates the time round
>> trip time.
>> > It's something like - "Status: OK (30 ms)".
>> > Is there any way to achieve this in Kamailio by using
>> nathelper??module, or any other?
>>
>> I think the only way to do this is to make this yourself (tm). In your
>> favorite scripting language, query the locations and fire OPTIONS and
>> measure the time for a response (if any) on basis of the "random" callid
>> you create. If you route these requests through kamailio you will
>> prevent any NAT problems or connection with TCP endpoints.
>>
>> _______________________________________________
>> Kamailio (SER) - Users Mailing List
>> sr-users at lists.kamailio.org
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>>
>>
>>
>> _______________________________________________
>>
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>>
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>>
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>>
>> --
>>
>> Daniel-Constantin Mierla -- www.asipto.com
>>
>> www.twitter.com/miconda -- www.linkedin.com/in/miconda
>>
>> Kamailio World Conference - May 6-8, 2019 -- www.kamailioworld.com
>>
>> Kamailio Advanced Training - Mar 4-6, 2019 in Berlin; Mar 25-27, 2019, in Washington, DC, USA -- www.asipto.com
>>
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>>
>>
>> --
>>
>> *Nuno Ferreira* | Architect, CoreUC | nferreira at fuze.com | +351 308805903
>> Rua Carlos Silva Melo Guimarães 23, 3800-126 Aveiro, Portugal
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>> --
>>
>> *Nuno Ferreira* | Architect, CoreUC | nferreira at fuze.com | +351 308805903
>> Rua Carlos Silva Melo Guimarães 23, 3800-126 Aveiro, Portugal
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-- 
Regards,

David Villasmil
email: david.villasmil.work at gmail.com
phone: +34669448337
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