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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/~rnewton?src=email" style="color: #3b73af; text-decoration: none"><img id="header-avatar-image" class="image_fix" src="cid:avatar_925838d3d8b1f71935f30b314c925d64" height="32" width="32" border="0" style="border-radius: 3px; vertical-align: top" /></a></td>
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<td class="notification-comment-pattern-container mobile-resize-text" style="padding: 0px; border-collapse: collapse; padding: 0px"><strong>Change comment:</strong> More text and diagram edits</td>
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<table class="content-excerpt-pattern" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 1px">
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<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 0 24px"> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; margin-top: 0">Asterisk includes the concepts of <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none">Device State</a> , <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none">Extension State</a> and <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none">Presence State</a> which together allow Asterisk applications and interfaces to receive information about the state of devices, extensions and the users of the devices.</p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">As an example, channel drivers like chan_sip or res_pjsip/chan_pjsip may both provide devices with device state, plus allow devices to </span><a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">subscribe to hints</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> to receive notifications of state change. Other examples would be app_queue which takes into consideration the device state of queue members to influence queue logic or the Asterisk Manager Interface which provides actions for </span><a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">querying extension state and presence state</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">.</span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">Additionally, modules exist for <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none">Corosync</a> and <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none">XMPP PubSub</a> support to allow device state <span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color: #ddfade;">to be </span>shared and distributed across multiple systems.</p> <p class="diff-block-context" style="margin: 10px 0 0 0">The sub-sections here describe these concepts, point to related module specific configuration sections and discuss <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none">Querying and Manipulating State</a> information.</p> <p class="diff-block-target" style="margin: 10px 0 0 0"> <span class="diff-html-added" id="added-diff-2" style="font-size: 100%; background-color: #ddfade;">The figure below may help you get an idea of the overall use of states and presence with the Asterisk system. It has been simplified to focus on the flow and usage of state and presence. In reality, the architecture can be a bit more confusing. For example a module could both provide subscription functionality for a subscriber and be the same module providing the devices and device state on the other end.</span> </p> <p class="diff-block-context" style="margin: 10px 0 0 0"></p>
<table class="diff-macro bodyless" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;margin: 5px 0; padding: 0; width: auto;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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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-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=gliffy" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Gliffy Diagram</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">name</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">StateAndPresenceOverview</td>
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