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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> UNDER CONSTRUCTION</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/display/AST/Asterisk+Architecture%2C+The+Big+Picture?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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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;"><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/_/images/icons/macrobrowser/dropdown/warning.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Warning</span></th>
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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-added" style="font-size: 100%; background-color: #ddfade;">UNDER CONSTRUCTION - IGNORE PAGE UNTIL THIS WARNING IS REMOVED</span> </p> </td>
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</table> <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;"> </span> </p> <p class="diff-block-context" style="margin: 10px 0 0 0">Before we dive too far into the various types of modules, let's first take a step back and look at the overall architecture of Asterisk.</p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-removed" id="removed-diff-0" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span class="diff-html-removed diff-html-image-container" style="background-color: #ffe7e7;display: inline-block;position: relative;text-align: center;"><img class="confluence-embedded-image" width="300" src="/wiki/download/attachments/4817479/bigpicture.png?version=1&modificationDate=1281467366282&api=v2" data-image-src="/wiki/download/attachments/4817479/bigpicture.png?version=1&modificationDate=1281467366282&api=v2" /><span class="diff-image-overlay diff-removed-image" style="color: #535353;display: block;padding: 4px 4px 8px 4px;text-decoration: none;">Image Removed</span></span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Asterisk Architecture</span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">We need to add CEL and Bridge modules to this picture, and take CLI and Manager out for now</span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">The </span><span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color: #ddfade;">This documentation isn't intended for an Asterisk source developer so we'll use a simplified diagram to illustrate the relationships of some of Asterisk's components. We primarily want to show Asterisk component relationships to entities outside Asterisk, as Asterisk is typically not operating by itself.</span> </p>
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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-added" style="font-size: 100%; background-color: #ddfade;">PLACEHOLDER FOR DIAGRAM</span> </p> </td>
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</table> <h1 id="AsteriskArchitecture,TheBigPicture-AsteriskArchitecture" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Asterisk Architecture</span> </h1> <h2 id="AsteriskArchitecture,TheBigPicture-TheCore" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0; margin-top: 10px"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">The Core</span> </h2> <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;">The </span>heart of any Asterisk system is the <strong>core</strong>. The PBX core is the essential component that takes care <span class="diff-html-removed" id="removed-diff-1" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">of bridging calls. The core also takes care of other items like reading </span><span class="diff-html-added" id="added-diff-2" style="font-size: 100%; background-color: #ddfade;">tying everything together. Among many functions it reads </span>the configuration files<span class="diff-html-added" id="added-diff-3" style="font-size: 100%; background-color: #ddfade;">, including dialplan </span>and <span class="diff-html-removed" id="removed-diff-2" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">loading </span><span class="diff-html-added" id="added-diff-4" style="font-size: 100%; background-color: #ddfade;">loads all </span>the other <strong><span class="diff-html-changed" id="changed-diff-0" style="background-color: #d6f0ff;">modules</span></strong>.<span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span class="diff-html-removed" id="removed-diff-3" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">We'll talk more about the core below, but for now just remember that all the other modules connect to it</span> </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;">The core loads and builds the dialplan, which is the logic of any Asterisk system. The dialplan contains a list of instructions that Asterisk should follow to know how to handle incoming and outgoing </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">calls</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> on the system.</span> </p> <h2 id="AsteriskArchitecture,TheBigPicture-Modules" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Modules</span> </h2> <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;">Other than functionality provided by the core of Asterisk, modules provide all other functionality. The source for many modules is distributed with Asterisk, though other modules may be available from community members or even businesses that make commercial modules.</span> </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;">Modules are not only optionally built, but you can affect at load-time whether they will be loaded at all, the loading order or even unload/load them during run-time. Most modules are independently configurable and have their own configuration files. Some modules have support for configuration to be read statically or dynamically(realtime) from database backends</span>.</p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">From a logistical standpoint, these modules are typically files with a <strong>.so</strong> file extension, which live in the Asterisk <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none"><span class="diff-html-changed" id="changed-diff-2" style="background-color: #d6f0ff;">modules directory</span></a><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span>(which is typically <strong>/usr/lib/asterisk/modules</strong>). When <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none"><span class="diff-html-changed" id="changed-diff-3" style="background-color: #d6f0ff;">Asterisk starts up</span></a>, it loads these files and adds their functionality to the system.</p> <p class="diff-block-target" style="margin: 10px 0 0 0"> <span class="diff-html-added" id="added-diff-6" style="font-size: 100%; background-color: #ddfade;">Asterisk modules which are part of the core have a file name that look like </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">pbx_xxxxx.so</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">. All of the modules types are discussed in the section </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;">Types of Asterisk Modules</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">.</span> </p>
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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">A Plethora of Modules</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"><span class="diff-html-changed" id="changed-diff-4" style="background-color: #d6f0ff;">Take just a minute and go look at the Asterisk modules directory on your system. You should find a wide variety of modules. A </span><span class="diff-html-removed" id="removed-diff-4" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">typical </span><span class="diff-html-added" id="added-diff-7" style="font-size: 100%; background-color: #ddfade;">default installation of </span><span class="diff-html-changed" id="changed-diff-5" style="background-color: #d6f0ff;">Asterisk </span><span class="diff-html-removed" id="removed-diff-5" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">system </span><span class="diff-html-changed" id="changed-diff-6" style="background-color: #d6f0ff;">has over one hundred fifty different modules!</span></td>
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</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-removed" id="removed-diff-6" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">The core also contains the dialplan, which is the logic of any Asterisk system. The dialplan contains a list of instructions that Asterisk should follow to know how to handle incoming and outgoing calls on the system.</span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Asterisk modules which are part of the core have a file name that look like </span><strong><span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">pbx_xxxxx.so</span></strong><span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">.</span> </p> <h2 id="AsteriskArchitecture,TheBigPicture-Calls" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" id="added-diff-8" style="font-size: 100%; background-color: #ddfade;">Calls</span> </h2> <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 was mentioned in the </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;">Asterisk as a Swiss Army Knife of Telephony</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> section, the primary purpose of Asterisk is as an engine for building Real Time Communication systems and applications.</span> </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;">In most but not all cases this means you'll deal with the concept of "calls". Calls in telephony terminology typically refer to one phone communicating with (calling) another phone over a medium, such as a </span><a href="http://en.wikipedia.org/wiki/Public_switched_telephone_network" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">PSTN</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> line.</span> </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;"> </span> </p> </td>
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