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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>TryExec()</title><link rel="stylesheet" href="styles.css" type="text/css" /><meta name="generator" content="DocBook XSL Stylesheets V1.69.1" /><link rel="start" href="index.html" title="Asterisk™: The Future of Telephony" /><link rel="up" href="asterisk-APP-B.html" title="Appendix B. Application Reference" /><link rel="prev" href="asterisk-APP-B-227.html" title="Transfer()" /><link rel="next" href="asterisk-APP-B-228.html" title="TrySystem()" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">TryExec()</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="asterisk-APP-B-227.html">Prev</a> </td><th width="60%" align="center">Appendix B. Application Reference</th><td width="20%" align="right"> <a accesskey="n" href="asterisk-APP-B-228.html">Next</a></td></tr></table><hr /></div><div class="refentry" lang="en" xml:lang="en"><a id="asterisk-APP-B-302"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>TryExec() — Tries to execute an Asterisk application</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><a id="I_programlisting_tt2482"></a><pre class="programlisting">TryExec(<em class="replaceable"><code>app(args)</code></em>)</pre></div><div class="refsect1" lang="en" xml:lang="en"><a id="id4200436"></a><h2></h2><p><a id="I_indexterm_tt2483" class="indexterm"></a>Attempts to run the specified Asterisk application.</p><p>This application is very similar to the <code class="literal">Exec()</code> application, except that it always
returns normally, whereas the <code class="literal">Exec()</code>
application will act as if the underlying application was natively
called, including exit status. This application can be used to catch a
condition that would normally cause the underlying application to exit
abnormally.</p><a id="I_programlisting_tt2484"></a><pre class="programlisting">
<span class="strong"><strong>exten => 123,1,TryExec(VMAuthenticate(@default))</strong></span>
</pre></div><div class="refsect1" lang="en" xml:lang="en"><a id="asterisk-APP-B-333"></a><h2>See Also</h2><p>
<a href="asterisk-APP-B-71.html" title="Exec()"><span class="refentrytitle">Exec()</span></a>
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="asterisk-APP-B-227.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="asterisk-APP-B.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="asterisk-APP-B-228.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Transfer() </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> TrySystem()</td></tr></table></div><div xmlns="" id="svn-footer"><hr /><p>You are reading <em>Asterisk: The Future of Telephony</em> (2nd Edition for Asterisk 1.4), by Jim van Meggelen, Jared Smith, and Leif Madsen.<br />
This work is licensed under the <a href="http://creativecommons.org/licenses/by-nc-nd/3.0/">Creative Commons Attribution-Noncommercial-No Derivative Works License v3.0</a>.<br />
To submit comments, corrections, or other contributions to the text, please visit <a href="http://oreilly.com/catalog/9780596510480/">http://www.oreilly.com/</a>.</p></div></body></html>
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