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<div class="div">
<h1>Mode Modify Procedure</h1>

<p>This feature includes the configuration of transmission
devices on the infrastructure side (BTS, TRAU, and BSC), and the configuration
of the MS. The purpose of this feature is to modify the channel type within
the used TCH. The possible changes are:</p>


<ul>
<li><p>Signalling to speech</p>
</li>
<li><p>Speech to data</p>
</li>
<li><p>Data to speech</p>
</li>
<li><p>Data transmission speed.</p>
</li>
</ul>


<p>The ASSIGNMENT REQUEST message from the MSC starts the
procedure.</p>
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