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<h2>Impact on Network Switching Subsystem (NSS)</h2>

<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 <span class="parameter-sem">HANDOVER REQUEST</span> and <span class="parameter-sem">COMMON ID</span> messages. That MSC must also support Inter-PLMN
handover.</p>


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<h3>Multiple PLMN and Inter-PLMN Handover Support
in MSC &amp; HLR</h3>
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<p>This software product must be enabled in the MSC for handovers between
PLMNs to be possible. For more information, see <em>Feature 1168: Multiple
PLMN and Inter-PLMN Handover Support in MSC &amp; HLR</em> in MSC documentation.</p>


<p>For instructions on configuring the IMSI transmission in MSC, see <em>Base
Station Controller Handling in MSC</em> in MSC documentation.</p>
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