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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> Remove construction sign and tweaks, links</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-removed" id="removed-diff-0" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"><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-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">UNDER CONSTRUCTION - IGNORE PAGE UNTIL THIS WARNING IS REMOVED</span> </p> </td>
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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/_/images/icons/macrobrowser/dropdown/column.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Column</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">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 style="margin: 10px 0 0 0">Asterisk a big program with many components, with complex relationships. To be able to use it, you don't have to know how everything relates in extreme detail. Below is a simplified diagram intended to illustrate the relationships of some major components to each other and to entities outside Asterisk. It is useful to understand how a component may relate to things outside Asterisk as Asterisk is not typically operating without some connectivity or interaction with other network devices or files on the local system.</p> <h1 id="AsteriskArchitecture,TheBigPicture-AnAsteriskSystem" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0">An Asterisk System</h1> <p style="margin: 10px 0 0 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-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">AsteriskArchitecture</td>
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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">size</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">800</td>
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</table> <p style="margin: 10px 0 0 0"></p> <p style="margin: 10px 0 0 0">Remember this is not an exhaustive diagram. It covers only a few of the common relationships between certain components.</p> </td>
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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/_/images/icons/macrobrowser/dropdown/panel.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Panel</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">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-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/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">maxLevel</td>
<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> <p class="diff-block-target" style="margin: 10px 0 0 0">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 <a href="http://en.wikipedia.org/wiki/Public_switched_telephone_network" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">PSTN</a> line. However in the case of Asterisk a call typically references one or more <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none"><strong><span class="diff-html-changed" id="changed-diff-0" style="background-color: #d6f0ff;">channels</span></strong></a><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span>existing in Asterisk.</p> <p class="diff-block-context" style="margin: 10px 0 0 0">Here are some example "calls".</p>
<ul class="diff-block-target" style="margin: 10px 0 0 0">
<li>A phone calling another phone through Asterisk.</li>
<li>A phone calling many phones at once (<span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">for example, </span>paging) through Asterisk.</li>
<li>A phone calls an application or the reverse happens. e.g., app_voicemail or app_queue</li>
<li>A local channel is created and interacts with an application or another channel.</li>
</ul> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">Note that I primarily use phones as an example, however you could refer to any channel or group of channels as a call<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-1" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">whether or not </span><span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color: #ddfade;">. It doesn't matter if </span>the devices are phones or something else, like an alarm system sensor or garage door opener.</p> <h3 id="AsteriskArchitecture,TheBigPicture-Channels" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0">Channels</h3> <p class="diff-block-target" style="margin: 10px 0 0 0"> <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none"><span class="diff-html-changed" id="changed-diff-1" style="background-color: #d6f0ff;">Channels</span></a><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span>are created by Asterisk using <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;">Channel Drivers</span></a>. They can utilize other resources in the Asterisk system to facilitate various types of communication between one or more devices. Channels can be <strong>bridged</strong> to other channels and be affected by <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none"><strong><span class="diff-html-changed" id="changed-diff-3" style="background-color: #d6f0ff;">applications</span></strong></a><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span>and <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none"><strong><span class="diff-html-changed" id="changed-diff-4" style="background-color: #d6f0ff;">functions</span></strong></a>. Channels can make use of many other resources provided by other modules or external libraries. For example <span class="diff-html-removed" id="removed-diff-2" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">many </span>SIP channels <span class="diff-html-added" id="added-diff-2" style="font-size: 100%; background-color: #ddfade;">when </span>passing audio will make use of the <strong>codec</strong> and <strong>format</strong> modules. Channels may interact with many different modules at once.</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p class="diff-block-target" style="margin: 10px 0 0 0">Dialplan is the one main method of directing Asterisk behavior. Dialplan exists as text files (for example extensions.conf) either in the built-in dialplan scripting language, AEL or LUA formats. Alternatively dialplan could be read from a <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none"><span class="diff-html-changed" id="changed-diff-5" style="background-color: #d6f0ff;">database</span></a>, along with other module configuration. When writing dialplan, you will make heavy use of <strong>applications</strong> and <strong>functions </strong>to affect channels, configuration and features.</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> </td>
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