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<td id="header-avatar-image-container" valign="top" style="padding: 0px; border-collapse: collapse; vertical-align: top; width: 32px; padding-right: 9px"><a href="https://wiki.asterisk.org/wiki/display/~mjordan?src=email" style="color: #3b73af; text-decoration: none"><img id="header-avatar-image" class="image_fix" src="cid:avatar_ce51dcf276530e4a4b00548e2a6d0905" height="32" width="32" border="0" style="border-radius: 3px; vertical-align: top" /></a></td>
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<td id="page-title-pattern-icon-image-container-cell" style="padding: 0px; border-collapse: collapse; width: 16px; padding: 9px 8px 0px 0px; mso-text-raise: 5px; mso-line-height-rule: exactly"><a href="https://wiki.asterisk.org/wiki/pages/viewpage.action?pageId=30278158&src=email" title="page icon" style="vertical-align: top;; color: #3b73af; text-decoration: none"><img style="vertical-align: top; display: block;" src="cid:page-icon" alt="page icon" title="page icon" height="16" width="16" border="0" /></a></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">This page is not complete yet. Please refrain from commenting until this warning is removed.</span> </p> </td>
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</table> <p style="margin: 10px 0 0 0"> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> </p> <h1 id="ResourceListSubscriptions(RLS)-Overview" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0">Overview</h1> <p style="margin: 10px 0 0 0">Beginning in Asterisk 13, Asterisk supports RFC 4662 resource list subscriptions in its PJSIP-based SIP implementation.</p> <p style="margin: 10px 0 0 0">In a PBX environment, it is common for SIP devices to subscribe to many resources offered by the PBX. This holds especially true for presence resources. Consider a small office where an Asterisk server acts as a PBX for 20 people, each with a SIP desk phone. Each of those 20 phones subscribes to the state of the others in the office. In this case, each of the phones would create 19 subscriptions (since the phone does not subscribe to its own state). When totalled, the Asterisk server would maintain 20 * 19 = 380 subscriptions. For an office with 30 people, the total number of subscriptions becomes 30 * 29 = 870 subscriptions. For an office with 40 people, the total number of subscriptions becomes 40 * 39 = 1560. That is about four times the number of subscriptions for the 20-person office, despite only having twice the number of people. The number of subscriptions follows a geometric progression, leading to a situation commonly called an <em>N-squared</em> problem. In other words, the amount of traffic generated and amount of server resources required are proportional to the square of the number of users (N) on the system. The N-squared problem with subscriptions can be a limiting factor for PBX deployers for several reasons:</p>
<ul style="margin: 10px 0 0 0">
<li>In a situation where all phones boot up simultaneously, each of the phones will be sending out their SIP SUBSCRIBEs nearly simultaneously, placing a larger-than-average burden on the Asterisk server's CPU.</li>
<li>In the SIP stack, N-squared long-term SIP dialogs have to be maintained, tying up more system resources (e.g. memory).</li>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">title</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">On this Page</td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <p style="margin: 10px 0 0 0; margin-top: 0"></p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB/5635/60fd2eb45debbf4ede2b669f4c9b96b4ce40a937.48/_/images/icons/macrobrowser/dropdown/toc.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Table of Contents</th>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">2</td>
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</table> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> </td>
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