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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>StackPop()</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-212.html" title="SoftHangup()" /><link rel="next" href="asterisk-APP-B-313.html" title="StartMusicOnHold()" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">StackPop()</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="asterisk-APP-B-212.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-313.html">Next</a></td></tr></table><hr /></div><div class="refentry" lang="en" xml:lang="en"><a id="asterisk-APP-B-306"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>StackPop() — Removes last address from <code class="literal">Gosub()</code> stack</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><a id="I_programlisting_tt2458"></a><pre class="programlisting">StackPop()</pre></div><div class="refsect1" lang="en" xml:lang="en"><a id="id4199375"></a><h2></h2><p><a id="I_indexterm_tt2459" class="indexterm"></a>Removes the last address from the <code class="literal">Gosub()</code> stack. This is frequently used when
handling error conditions within <code class="literal">Gosub()</code> routines when it is no longer
appropriate to return control of the dialplan back to where the <code class="literal">Gosub()</code> routine was called from.</p><a id="I_programlisting_tt2460"></a><pre class="programlisting">exten => s,1,Read(input,get-input)
exten => s,n,Gosub(validate,1)
exten => s,n,Dial(SIP/${input})
; Ensure that input is between 400 and 499
exten => validate,1,GotoIf($[ ${input} > 499 ]?error,1)
exten => validate,n,GotoIf($[ ${input} < 400 ]?error,1)
exten => validate,n,Return
<span class="strong"><strong>exten => error,1,StackPop()</strong></span>
exten => error,2,Goto(s,1)</pre></div><div class="refsect1" lang="en" xml:lang="en"><a id="asterisk-APP-B-331"></a><h2>See Also</h2><p><a href="asterisk-APP-B-305.html" title="Return()"><span class="refentrytitle">Return()</span></a>, <a href="asterisk-APP-B-258.html" title="Gosub()"><span class="refentrytitle">Gosub()</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-212.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-313.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">SoftHangup() </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> StartMusicOnHold()</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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