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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> Look! content!</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-changed" id="changed-diff-0" 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/5639/a252d7f5e75d7a8bf7047b4b2c92f71a56a8f048.48/_/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-changed" style="background-color: #d6f0ff;">Under Construction</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-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/5639/a252d7f5e75d7a8bf7047b4b2c92f71a56a8f048.48/_/images/icons/macrobrowser/dropdown/note.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Note</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;">Top-level page for pages describing how to use functions, pointing to the auto-generated function reference pages and possibly going into detail on a few of the commonly used or very detailed functions.</span> </p> </td>
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<h1 id="Functions-AsteriskDialplanFunctions" style="margin: 10px 0 0 0; margin-top: 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0; margin-top: 0"> <span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">Asterisk Dialplan Functions</span> </h1>
<p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Asterisk functions are very similar to functions in many programming languages.</span> </p>
<p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Functions are:</span> </p>
<ul style="margin: 10px 0 0 0">
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Sophisticated subroutines that help you manipulate data in a variety of ways.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Callable from within dialplan and Asterisk's various interfaces.</span> </li>
</ul>
<p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Compared to Dialplan Applications:</span> </p>
<ul style="margin: 10px 0 0 0">
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Dialplan Functions tend to be geared towards manipulating channel data and attributes as well as providing general tools for manipulating data in variables and expressions, whether they are channel related or not.</span> </li>
<li> <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 Applications</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> tend to take over the channel and provide more complex features to the channel.</span> </li>
</ul>
<p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Both will be typically be used with a channel but in different ways. For example you may send a channel to an application such as Playback and then let it fly, but with functions you might use one or many functions in a single expression to manipulate or move around data related to the channels operation.</span> </p>
<p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Applications and functions are regularly used together and as you use them you'll see that the distinction between applications and the more powerful functions can sometimes be murky.</span> </p>
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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/5639/a252d7f5e75d7a8bf7047b4b2c92f71a56a8f048.48/_/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;">In This Section</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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<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/5639/a252d7f5e75d7a8bf7047b4b2c92f71a56a8f048.48/_/images/icons/macrobrowser/dropdown/children.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Children Display</span></th>
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<h2 id="Functions-Availablefunctions" style="margin: 10px 0 0 0; margin-top: 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0; margin-top: 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Available functions</span> </h2>
<p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Many functions come with Asterisk by default. For a complete list of the dialplan functions available to your installation of Asterisk, type </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">core show functions</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> at the Asterisk CLI. Not all functions are compiled with Asterisk by default, so if you have the source available then you may want to browse the functions listed in </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;">menuselect</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> under "Dialplan Functions". Dedicated function modules start with "func_", but the core or other large modules may provide functions as well.</span> </p>
<p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Since anyone can write an Asterisk module they can also be obtained from sources outside the Asterisk distribution. Pre-packaged community or commercial Asterisk distributions that have a special purpose may include a custom function or two.</span> </p>
<h2 id="Functions-Generalfunctionsyntax" 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;">General function syntax</span> </h2>
<p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">The general syntax for calling a function follows:</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"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">FUNCTION(argument1,argument2, ...)</span>
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<p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">A function's value can be set using the Set application. The example below will show how to set the CHANNEL function argument "tonezone" to the value "de" (for Germany).</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"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">same => n,Set(CHANNEL(tonezone)=de)</span>
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<p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">A function's value can be referenced almost anywhere in dialplan where you can use an expression or reference a variable. The value can be referenced by encapsulating the call with curly braces and a leading dollar sign.</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"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">${FUNCTION(argument)}</span>
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<p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">For example, if we wanted to log the destination address for the audio stream of the channel:</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"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">same => n,Log(NOTICE, The destination for the audio stream is: ${CHANNEL(rtp,dest)})</span>
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<h2 id="Functions-Helpforspecificfunctions" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span style="color: rgb(133,120,102);"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Help for specific functions</span></span> </h2>
<p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">The wiki section CLI Syntax and Help Commands details how to use the CLI-accessible documentation. This will allow you to access the syntax and usage info for each function including detail on all the arguments for each function.</span> </p>
<p style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Wikibot also publishes the same documentation on the wiki. You can find function docs in the version specific top level sections; such as Asterisk 13 Dialplan Functions.</span> </p>
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