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<h3>Inter-system handover and UMTS changes in MSC</h3>

<p>Inter-system handover is a basic requirement for the operators
who want to ensure a successful migration to 3G and want to be able to offer
a wide range of high quality services for 2G and/or 3G subscribers. It enables
a variety of business strategies for all types of operators, because roaming
agreements are possible between GSM and UMTS operators and the operator can
also support both GSM and UMTS in his own network.</p>


<p>When GSM-WCDMA Inter-System Handover is activated, the
following types of handovers are supported:</p>


<ul>
<li><p>Inter-system RNC &lt; &gt; BSC R99</p>
</li>
<li><p>Intra-system RNC &lt; &gt; RNC</p>
</li>
<li><p>BSC R98/R99 &lt; &gt; BSC R98/R99</p>
</li>
</ul>


<p>The handovers mentioned above are possible in Inter MSC
(Inter PLMN and Intra PLMN) and Intra MSC (Inter PLMN and Intra PLMN).</p>


<p>Handover BSC R98 -&gt; UMTS is not possible.</p>
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