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Hello,<br>
<br>
sctp is the best by design protocol for sip, however, the
implementations (libs/kernel/etc) are young comparing with the other
transports, so you need to to some testing on performances and be
sure you keep using the latest kernel.<br>
<br>
tcp is quite scalable, but the state maching the read the sip
messages from the streams is more complex than the udp (where is
just a read). On the other hand, you get rid of retranmissions.<br>
<br>
udp should still be the most flexible and fast in routing, even in
some cases there might be retransmissions. In your network, when the
connection is more or less guaranteed with good speed, that is very
unlikely to happen. Also, you can control the nodes and be sure UDP
fragmentation is properly handled (all recent linuxes/bsdes do it).<br>
<br>
As a conclusion, I would go for UDP if the nodes are in same network
or network that has QoS guaranteed, with not very long distance
between the nodes.<br>
<br>
If I would have time to play, perhaps I would look a bit at sctp. I
haven't seen a good reason to go for tcp inside the internal network.<br>
<br>
Cheers,<br>
Daniel<br>
<br>
<div class="moz-cite-prefix">On 24/03/15 08:21, Mickael Marrache
wrote:<br>
</div>
<blockquote cite="mid:106901d06603$37a91fb0$a6fb5f10$@gmail.com"
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<p class="MsoNormal"><span lang="EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We are deploying a VoIP
system based on Kamailio. The system is composed of load
balancers, proxies, registrars, etc<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">What is the recommended
transport protocol to use for internal communication (i.e.
load balancer <-> proxy/registrar)? We started with
UDP but we also see that Kamailio supports TCP and SCTP.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">For information, at
first stage, the UAs will communicate using UDP but we may
need to use TCP in case messages are too large (we had such
issues when using ICE).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Mickael<o:p></o:p></span></p>
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<br>
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<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla
<a class="moz-txt-link-freetext" href="http://twitter.com/#!/miconda">http://twitter.com/#!/miconda</a> - <a class="moz-txt-link-freetext" href="http://www.linkedin.com/in/miconda">http://www.linkedin.com/in/miconda</a>
Kamailio World Conference, May 27-29, 2015
Berlin, Germany - <a class="moz-txt-link-freetext" href="http://www.kamailioworld.com">http://www.kamailioworld.com</a></pre>
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