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                            Asterisk Project : Asterisk 13 Application_WaitForSilence
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            Created by <span class='author'> wikibot</span> on Aug 08, 2014
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                    <h1 id="Asterisk13Application_WaitForSilence-WaitForSilence()">WaitForSilence()</h1>

<h3 id="Asterisk13Application_WaitForSilence-Synopsis">Synopsis</h3>

<p>Waits for a specified amount of silence.</p>

<h3 id="Asterisk13Application_WaitForSilence-Description">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 <code>WAITSTATUS</code> to one of these values:</p>

<ul>
	<li><code>WAITSTATUS</code>
	<ul>
		<li>SILENCE - if exited with silence detected.</li>
		<li>TIMEOUT - if exited without silence detected after timeout.</li>
	</ul>
	</li>
</ul>


<h3 id="Asterisk13Application_WaitForSilence-Syntax">Syntax</h3>


<div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent">
<pre>WaitForSilence(silencerequired,[iterations,[timeout]])</pre>
</div></div>

<h5 id="Asterisk13Application_WaitForSilence-Arguments">Arguments</h5>

<ul>
	<li><code>silencerequired</code></li>
	<li><code>iterations</code> - If not specified, defaults to <code>1</code>.</li>
	<li><code>timeout</code> - Is specified only to avoid an infinite loop in cases where silence is never achieved.</li>
</ul>


<h3 id="Asterisk13Application_WaitForSilence-SeeAlso">See Also</h3>

<ul>
	<li><a href="Asterisk-13-Application_WaitForNoise_29394443.html">Asterisk 13 Application_WaitForNoise</a></li>
</ul>


<h3 id="Asterisk13Application_WaitForSilence-ImportVersion">Import Version</h3>

<p>This documentation was imported from Asterisk Version SVN-branch-13-r420538</p>
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                    <p>Document generated by Confluence on Aug 11, 2014 13:46</p>
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