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<h2><a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+11+Application_WaitForSilence">Asterisk 11 Application_WaitForSilence</a></h2>
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<h1><a name="Asterisk11Application_WaitForSilence-WaitForSilence%28%29"></a>WaitForSilence()</h1>
<h3><a name="Asterisk11Application_WaitForSilence-Synopsis"></a>Synopsis</h3>
<p>Waits for a specified amount of silence.</p>
<h3><a name="Asterisk11Application_WaitForSilence-Description"></a>Description</h3>
<p>Waits for up to <em>silencerequired</em> milliseconds of silence, <em>iterations</em> times. An optional <em>timeout</em> specified the number of seconds to return after, even if we do not receive the specified amount of silence. Use <em>timeout</em> with caution, as it may defeat the purpose of this application, which is to wait indefinitely until silence is detected on the line. This is particularly useful for reverse-911-type call broadcast applications where you need to wait for an answering machine to complete its spiel before playing a message.</p>
<p>Typically you will want to include two or more calls to WaitForSilence when dealing with an answering machine; first waiting for the spiel to finish, then waiting for the beep, etc.</p>
<p>Examples:</p>
<p>WaitForSilence(500,2) will wait for 1/2 second of silence, twice</p>
<p>WaitForSilence(1000) will wait for 1 second of silence, once</p>
<p>WaitForSilence(300,3,10) will wait for 300ms silence, 3 times, and returns after 10 sec, even if silence is not detected</p>
<p>Sets the channel variable <tt>WAITSTATUS</tt> to one of these values:</p>
<ul>
<li>WAITSTATUS
<ul>
<li>SILENCE - if exited with silence detected.</li>
<li>TIMEOUT - if exited without silence detected after timeout.</li>
</ul>
</li>
</ul>
<h3><a name="Asterisk11Application_WaitForSilence-Syntax"></a>Syntax</h3>
<div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent">
<pre>WaitForSilence(silencerequired,iterations,timeout)</pre>
</div></div>
<h5><a name="Asterisk11Application_WaitForSilence-Arguments"></a>Arguments</h5>
<ul>
<li>silencerequired</li>
<li>iterations - If not specified, defaults to <tt>1</tt>.</li>
<li>timeout - Is specified only to avoid an infinite loop in cases where silence is never achieved.</li>
</ul>
<h3><a name="Asterisk11Application_WaitForSilence-SeeAlso"></a>See Also</h3>
<ul>
<li><a href="/wiki/pages/createpage.action?spaceKey=AST&title=Asterisk+11+Application_WaitForNoise&linkCreation=true&fromPageId=20187141" class="createlink">Asterisk 11 Application_WaitForNoise</a></li>
</ul>
<h3><a name="Asterisk11Application_WaitForSilence-ImportVersion"></a>Import Version</h3>
<p>This documentation was imported from Asterisk Version SVN-trunk-r370322</p>
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