[SR-Users] Kamailio OPTIONS Round-Trip

[Daniel-Constantin Mierla]

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
> <mailto: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.
>
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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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