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<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 0 24px"> <h1 id="Asterisk16Function_EVAL_EXTEN-EVAL_EXTEN()" 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">EVAL_EXTEN()</h1> <h3 id="Asterisk16Function_EVAL_EXTEN-Synopsis" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0">Synopsis</h3> <p style="margin: 10px 0 0 0">Evaluates the contents of a dialplan extension and returns it as a string.</p> <h3 id="Asterisk16Function_EVAL_EXTEN-Description" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0">Description</h3> <p style="margin: 10px 0 0 0">The EVAL_EXTEN function looks up a dialplan entry by context,extension,priority, evaluates the contents of a Return statement to resolve any variable or function references, and returns the result as a string.</p> <p style="margin: 10px 0 0 0">You can use this function to create simple user-defined lookup tables or user-defined functions.</p>
<div class="code panel pdl" style="border-width: 1px;">
<div class="codeHeader panelHeader pdl" style="border-bottom-width: 1px;">
<b>Example: Custom dialplan functions</b>
</div>
<div class="codeContent panelContent pdl">
<pre class="theme: Confluence; brush: cpp; gutter: true" style="font-size:12px;; margin: 10px 0 0 0; margin-top: 0">
[call-types]
exten => _1NNN,1,Return(internal)
exten => _NXXNXXXXXX,1,Return(external)
[udf]
exten => calleridlen,1,Return(${LEN(${CALLERID(num)})})
[default]
exten => _X!,1,Verbose(Call type ${EVAL_EXTEN(call-types,${EXTEN},1)} - ${EVAL_EXTEN(udf,calleridlen,1)})
</pre>
</div>
</div> <p style="margin: 10px 0 0 0">Any variables in the evaluated data will be resolved in the context of that extension. For example, <code style="font-family: monospace">${EXTEN</code>} would refer to the EVAL_EXTEN extension, not the extension in the context invoking the function. This behavior is similar to other applications, e.g. <code style="font-family: monospace">Gosub</code>.</p>
<div class="code panel pdl" style="border-width: 1px;">
<div class="codeHeader panelHeader pdl" style="border-bottom-width: 1px;">
<b>Example: Choosing which prompt to use</b>
</div>
<div class="codeContent panelContent pdl">
<pre class="theme: Confluence; brush: cpp; gutter: true" style="font-size:12px;; margin: 10px 0 0 0; margin-top: 0">
same => n,Read(input,${EVAL_EXTEN(prompts,${CALLERID(num)},1)})
[prompts]
exten => _X!,1,Return(default)
exten => _20X,1,Return(welcome)
exten => _2XX,1,Return(${DB(promptsettings/${EXTEN})})
exten => _3XX,1,Return(${ODBC_MYFUNC(${EXTEN})})
</pre>
</div>
</div> <p style="margin: 10px 0 0 0">Extensions on which EVAL_EXTEN is invoked are not different from other extensions. However, the application at that extension is not executed. Only the application data is parsed and evaluated.</p> <p style="margin: 10px 0 0 0">A limitation of this function is that the application at the specified extension isn't actually executed, and thus unlike a Gosub, you can't pass arguments in the EVAL_EXTEN function.</p> <h3 id="Asterisk16Function_EVAL_EXTEN-Syntax" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0">Syntax</h3>
<div class="preformatted panel" style="border-width: 1px;">
<div class="preformattedContent panelContent">
<pre style="margin: 10px 0 0 0; margin-top: 0">EVAL_EXTEN(context,extensions,priority)</pre>
</div>
</div> <h5 id="Asterisk16Function_EVAL_EXTEN-Arguments" style="margin: 10px 0 0 0; color: #707070; font-size: 14px; line-height: 20px; margin: 20px 0 0 0">Arguments</h5>
<ul style="margin: 10px 0 0 0">
<li> <code style="font-family: monospace">context</code> </li>
<li> <code style="font-family: monospace">extensions</code> </li>
<li> <code style="font-family: monospace">priority</code> </li>
</ul> <h3 id="Asterisk16Function_EVAL_EXTEN-SeeAlso" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0">See Also</h3>
<ul style="margin: 10px 0 0 0">
<li> <a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+16+Function_EVAL" style="color: #3b73af; text-decoration: none">Asterisk 16 Function_EVAL</a> </li>
</ul> <h3 id="Asterisk16Function_EVAL_EXTEN-ImportVersion" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0">Import Version</h3> <p style="margin: 10px 0 0 0">This documentation was imported from Asterisk Version GIT-16-4199afd</p> </td>
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