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<div class="div">
<h1>Overview of planning IMSI Based Handover</h1>

<p>Note the following restrictions when planning to use the
IMSI-Based Handover (IBHO) feature:</p>


<ul>
<li><p>The following BTS SW releases support IBHO:</p>


<ul>
<li><p>UltraSite: CX4.0 or newer.</p>
</li>
<li><p>MetroSite: CXM4.0 or newer.</p>
</li>
<li><p>TalkFamily: DF7 or newer.</p>
</li>
<li><p>Prime Site: DF7 or newer.</p>
</li>
</ul>


<a name="jan185151911" shape="rect"></a>
<dl class="note-notification">
<dt class="note-caption">Note</dt>
<dd>Nokia 2nd generation BTSs and Nokia InSite BTSs do not support IBHO.</dd>
</dl>
</li>
<li><p>IMSI Based Handover works with Nokia MSCs provided with M12 or
newer software. It also works with another vendor's MSC if that MSC always
sends IMSI to the BSC in the HANDOVER REQUEST and COMMON ID messages.
That MSC must also support Inter-PLMN handover.</p>
</li>
</ul>


<p>Note the following requirements when planning to use the IBHO feature:</p>


<ul>
<li><p>16 kbit/s telecom signalling links on the abis interface are
not powerful enough in cells where IBHO is enabled and if Half Rate codecs
are used. Links of at least 32 kbit/s are recommended.</p>
</li>
</ul>
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