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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi Julien,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">sounds interesting, a “location optimized routing mode”. What about making it as a dedicated mode, to not overloading the mode “8”?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Henning<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">-- <o:p>
</o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Henning Westerholt –
</span><span style="mso-fareast-language:EN-US"><a href="https://skalatan.de/blog/"><span lang="EN-GB" style="color:#0563C1">https://skalatan.de/blog/</span></a></span><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Kamailio services –
</span><span style="mso-fareast-language:EN-US"><a href="https://gilawa.com/"><span lang="EN-GB" style="color:#0563C1">https://gilawa.com</span></a></span><span style="mso-fareast-language:EN-US">
<span lang="EN-GB"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><b>From:</b> sr-dev <sr-dev-bounces@lists.kamailio.org>
<b>On Behalf Of </b>Julien Chavanton<br>
<b>Sent:</b> Thursday, May 14, 2020 7:26 PM<br>
<b>To:</b> Kamailio (SER) - Development Mailing List <sr-dev@lists.kamailio.org>; Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org><br>
<b>Subject:</b> [sr-dev] congestion control priority for priority based dispatching<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">Hi Folks,<o:p></o:p></p>
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<br>
Just found another simple use case of the dispatcher latency stats.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">Just shraing this idea of a feature I want to contribute.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><br>
When using dispatcher algorithm 8:<br>
<br>
“8” - select destination sorted by priority attribute value (serial forking ordered by priority).<br>
<br>
If the gateway as the attribute, the priority becomes the estimated latency.<br>
<br>
cc-priority<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">- The dispatcher would automatically prioritize the closest one.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">- If a gateway is becoming unresponsive it will automatically become de prioritize.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><br>
Consider this real life scenario where you have gateways in East and West Coast <o:p>
</o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">Example <o:p></o:p></p>
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URI: <a href="sip:28.71.19.140">sip:28.71.19.140</a>
<br>
FLAGS: AP<br>
PRIORITY: 10<br>
ATTRS: {<br>
BODY: cc_priority=1<br>
}<br>
LATENCY: {<br>
AVG: 84.001000<br>
STD: 0.062000<br>
EST: 84.001000 (high == low priority)<br>
MAX: 93<br>
TIMEOUT: 0<br>
URI: <a href="sip:28.71.16.140">sip:28.71.16.140</a><br>
FLAGS: AP<br>
PRIORITY: 10<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">ATTRS: {<br>
BODY: cc_priority=1<br>
}<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">LATENCY: {<br>
AVG: 29.110000<br>
STD: 2.383000<br>
EST: 31.999000 (low == high priority)<br>
MAX: 1499<br>
TIMEOUT: 1<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">Another major improvement to all of this would be to gather stats on INVITE <> 100 to have a very accurate latency estimation even if the gateway does not support SIP OPTIONS pings<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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