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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> added some final draft text. </td>
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<td id="page-title-pattern-icon-image-container" valign="top" style="padding: 0px; border-collapse: collapse; width: 16px; vertical-align: top">
<table cellspacing="0" cellpadding="0" border="0" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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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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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" id="page-title-pattern-header-container"><span id="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"><a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+Architecture%2C+The+Big+Picture?src=email" title="Asterisk Architecture, The Big Picture" style="color: #3b73af; text-decoration: none">Asterisk Architecture, The Big Picture</a></span></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">
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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/warning.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Warning</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">UNDER CONSTRUCTION - IGNORE PAGE UNTIL THIS WARNING IS REMOVED</p> </td>
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</table> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p>
<table class="diff-macro diff-html-added diff-block-target diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;background-color: #ddfade;border-color: #93c49f;; 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="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/section.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Section</span></th>
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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-1" 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/column.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Column</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-changed" id="changed-diff-1" style="background-color: #d6f0ff;">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.</span> </p> </td>
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</table> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</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">
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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" id="added-diff-2" style="font-size: 100%; background-color: #ddfade;">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 </span><span class="diff-html-changed" id="changed-diff-2" style="background-color: #d6f0ff;">to illustrate the relationships of some </span> </p> </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">
<table class="diff-macro" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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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" id="added-diff-3" style="font-size: 100%; background-color: #ddfade;">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.</span> </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"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">An Asterisk System</span> </h1> <p style="margin: 10px 0 0 0"></p>
<table class="diff-macro bodyless diff-html-changed" 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="diff-html-changed" id="changed-diff-3" style="background-color: #d6f0ff;"><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</span></th>
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<td class="diff-macro-properties" style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;padding: 0; border: 1px solid #dddddd;; padding: 0px; border-collapse: collapse">
<table style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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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"></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"></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"><span class="diff-html-changed" style="background-color: #d6f0ff;">name</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-changed" style="background-color: #d6f0ff;">AsteriskArchitecture</span></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"><span class="diff-html-changed" style="background-color: #d6f0ff;">size</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-changed" style="background-color: #d6f0ff;">800</span></td>
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</table> <p style="margin: 10px 0 0 0"></p> <p style="margin: 10px 0 0 0"> <span class="diff-html-added" id="added-diff-4" style="font-size: 100%; background-color: #ddfade;">Remember this is not an exhaustive diagram. It covers only a few of the common relationships between certain components.</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="diff-html-added" 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/column.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Column</span></th>
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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" 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/panel.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Panel</span></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"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">title</span></td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">On this Page</span></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-added" style="font-size: 100%; background-color: #ddfade;"> </span> </p>
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</table> <h1 id="AsteriskArchitecture,TheBigPicture-AsteriskArchitecture" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0">Asterisk Architecture</h1> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" id="added-diff-5" style="font-size: 100%; background-color: #ddfade;">Asterisk has a </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">core</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> that can interact with many </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">modules</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">. Modules called channel drivers provide </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channels</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> that follow Asterisk </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">dialplan</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> to execute programmed behavior and facilitate communication between devices or programs outside Asterisk. Channels often use </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">bridging</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> infrastructure to interact with other channels. We'll describe some of these concepts in brief below.</span> </p> <h2 id="AsteriskArchitecture,TheBigPicture-TheCore" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0">The Core</h2> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">The heart of any Asterisk system is the <strong>core</strong>. The PBX core is the essential component that <span class="diff-html-removed" id="removed-diff-3" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">takes care tying everything together</span><span class="diff-html-added" id="added-diff-6" style="font-size: 100%; background-color: #ddfade;">provides a lot of infrastructure</span>. Among many functions it reads the configuration files, including dialplan and loads all the other <strong>modules</strong><span class="diff-html-added" id="added-diff-7" style="font-size: 100%; background-color: #ddfade;">, distinct components that provide more functionality</span>.</p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">The core loads and builds the dialplan, which is the logic of any Asterisk system. The <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none"><span class="diff-html-changed" id="changed-diff-4" style="background-color: #d6f0ff;">dialplan</span></a><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span>contains a list of instructions that Asterisk should follow to know how to handle incoming and outgoing <strong>calls</strong> on the system.</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p class="diff-block-target" style="margin: 10px 0 0 0">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 class="diff-html-added" id="added-diff-8" style="font-size: 100%; background-color: #ddfade;">The modules distributed with Asterisk can be o</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;">ptionally be built</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> when Asterisk is built.</span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">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 <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;">configuration</span></a><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span>files. Some modules have support for configuration to be read statically or dynamically(realtime) from database backends.</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</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">Take just a minute and go look at the Asterisk modules directory on your system. You should find a wide variety of modules. A default installation of Asterisk has over one hundred fifty different modules!</td>
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</table> <h3 id="AsteriskArchitecture,TheBigPicture-AFewModuleExamples" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0"> <span class="diff-html-added" id="added-diff-9" style="font-size: 100%; background-color: #ddfade;">A Few Module Examples</span> </h3>
<ul class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">
<li> <strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">chan_pjsip</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> uses </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">res_pjsip</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> and many other res_pjsip modules to provide a SIP stack for SIP devices to interact with Asterisk and with each other through Asterisk.</span> </li>
<li> <strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">app_voicemail</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> provides traditional PBX-type voicemail features.</span> </li>
<li> <strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">app_confbridge</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> provides conference bridges with many optional features.</span> </li>
<li> <strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">res_agi</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> provides the Asterisk Gateway Interface, an API that allows call control from external scripts and programs.</span> </li>
</ul> <h2 id="AsteriskArchitecture,TheBigPicture-CallsandChannels" 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-changed" id="changed-diff-6" style="background-color: #d6f0ff;">Calls </span><span class="diff-html-added" id="added-diff-10" style="font-size: 100%; background-color: #ddfade;">and Channels</span> </h2> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">As was mentioned in the <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none">Asterisk as a Swiss Army Knife of Telephony</a> section, the primary purpose of Asterisk is <span class="diff-html-removed" id="removed-diff-4" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">as </span><span class="diff-html-added" id="added-diff-11" style="font-size: 100%; background-color: #ddfade;">being </span>an engine for building Real Time Communication systems and applications.</p> <p class="diff-block-target diff-block-context" 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. <span class="diff-html-added" id="added-diff-12" style="font-size: 100%; background-color: #ddfade;">However in the case of Asterisk a call typically references one or more </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">channels</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> existing in Asterisk.</span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" id="added-diff-13" style="font-size: 100%; background-color: #ddfade;">Here are some example "calls".</span> </p>
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<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">A phone calling another phone through Asterisk.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">A phone calling many phones at once (paging) through Asterisk.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">A phone calls an application or the reverse happens. e.g., app_voicemail or app_queue</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">A local channel is created and interacts with an application or another channel.</span> </li>
</ul> <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;">Note that I primarily use phones as an example, however you could refer to any channel or group of channels as a call whether or not the devices are phones or something else, like an alarm system sensor or garage door opener.</span> </p> <h3 id="AsteriskArchitecture,TheBigPicture-Channels" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Channels</span> </h3> <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;">Channels are created by Asterisk using Channel Drivers. They can utilize other resources in the Asterisk system to facilitate various types of communication between one or more devices. Channels can be </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">bridged</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> to other channels and be affected by </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">applications</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> and </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">functions</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">. Channels can make use of many other resources provided by other modules or external libraries. For example many SIP channels passing audio will make use of the </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">codec</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> and </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">format</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> modules. Channels may interact with many different modules at once.</span> </p> <h2 id="AsteriskArchitecture,TheBigPicture-Dialplan" 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;">Dialplan</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;">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 database, along with other module configuration. Dialplan can call out through other interfaces such as </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;">AGI</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> to receive call control instruction from external scripts and programs. 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;">Dialplan</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> section of the wiki goes into detail on the usage of dialplan.</span> <br /> <br /> </p> <p class="diff-block-context" style="margin: 10px 0 0 0"> </p> </td>
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