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<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">The Tag column size is 64. If I make this larger in the database, will it be truncated once it is loaded into memory?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Through which list do I need to iterate? You mentioned the data is stored in a hash table, what is the name of this hash table?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Basically for each call I need to call the load_gws() function, which is O(N) * O(M).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">What if I take a different approach and call a stored procedure (for each call) which does the selection of a gateway based on the supplied criteria.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Of course the tables would be optimized with indices for the best possible performance.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">When comparing load_gws() (O(N) * O(M)) with the stored procedure approach, would there be a huge performance loss when taking the stored procedure approach?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">I know this approach brings a whole new set of problem with availability and the loss of features, but for now I’m only interested in the performance aspect of both methods.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="color:windowtext;mso-fareast-language:NL">From:</span></b><span lang="EN-US" style="color:windowtext;mso-fareast-language:NL"> sr-users [mailto:sr-users-bounces@lists.sip-router.org]
<b>On Behalf Of </b>Vitaliy Aleksandrov<br>
<b>Sent:</b> Wednesday, April 29, 2015 12:27 PM<br>
<b>To:</b> sr-users@lists.sip-router.org<br>
<b>Subject:</b> Re: [SR-Users] LCR with gateway capabilities<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US" style="font-size:12.0pt;mso-fareast-language:NL"><o:p> </o:p></span></p>
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<p class="MsoNormal">On 29/04/15 12:34, Grant Bagdasarian wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#1F497D">That sounds possible! Thanks.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">That does this description mean: “</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Helvetica",sans-serif;background:white">Execution time of load_gws() function is O(N) * O(M), where
N is number of different prefix lengths and M is number of collisions for matching prefix(es) in lcr rules hash table of the LCR instance.”?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Helvetica",sans-serif;background:white"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Does this mean it loads the data from its internal memory or does it load the data from the database again?</span><o:p></o:p></p>
</blockquote>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:NL">load_gws() prepares an ordered list of gateways for current destination. It loads data only from internal in-memory gateways db (hash table).<br>
<br>
<o:p></o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">How fast does it select a gateway after load_gws using next_gw()? Is it O(N) again?</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:NL">O(1) since load_gws already prepared ordered (by price) list and next_gw() only takes next gw in a list.<br>
<br>
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">What about multiple combinations of capabilities? For example caller id spoofing and g729 codec, or caller id spoofing and g711ulaw codec? Etc.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Wouldn’t this cause the data to grow exponentially?
</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:NL">It would.<br>
<br>
Another idea:<br>
You can also have only one lcr instance and keep gateways capabilities in the tag field (serialized somehow). Then you can just iterate through a list generated by load_gws() skipping gateways which don't match your criteria and in the end a call will be routed
to the cheapest gateway with proper capabilities.<br>
<br>
<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="color:windowtext;mso-fareast-language:NL">From:</span></b><span lang="EN-US" style="color:windowtext;mso-fareast-language:NL"> sr-users [<a href="mailto:sr-users-bounces@lists.sip-router.org">mailto:sr-users-bounces@lists.sip-router.org</a>]
<b>On Behalf Of </b>Vitaliy Aleksandrov<br>
<b>Sent:</b> Wednesday, April 29, 2015 10:36 AM<br>
<b>To:</b> <a href="mailto:sr-users@lists.sip-router.org">sr-users@lists.sip-router.org</a><br>
<b>Subject:</b> Re: [SR-Users] LCR with gateway capabilities</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">What about configuring two LCR instances with different "lcr_id".<br>
The first one can use only gateways with requested capabilities and the second one all gateways.<br>
Then you can make a decision about which instance to use during call routing process providing this lcr_id to load_gws() function.<br>
<br>
<br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-US">Hello,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">From what I understand about the LCR module is that the rules have to be prioritized by the admin, be it manually or automatically by an application.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Let’s say the LCR database has 10 gateways, each with their own rules etc.
</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">4 of these gateways support caller id spoofing and the others don’t.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">But the other 6 are cheaper and Kamailio has to route a call using a gateway which support caller id spoofing and is the cheapest of the 4.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Would it be possible to tell the LCR module to select a gateway based on certain capabilities and is the cheapest of the ones which support a certain capability?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><br>
<br>
<br>
<br>
</span><o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list<o:p></o:p></pre>
<pre><a href="mailto:sr-users@lists.sip-router.org">sr-users@lists.sip-router.org</a><o:p></o:p></pre>
<pre><a href="http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users">http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users</a><o:p></o:p></pre>
</blockquote>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:NL"><br>
<br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list<o:p></o:p></pre>
<pre><a href="mailto:sr-users@lists.sip-router.org">sr-users@lists.sip-router.org</a><o:p></o:p></pre>
<pre><a href="http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users">http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users</a><o:p></o:p></pre>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:NL"><o:p> </o:p></span></p>
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