<p>according to rfc3261 19.1.4 URI Comparison</p>

<pre><code>Comparison of the userinfo of SIP and SIPS URIs is case-
         sensitive.  This includes userinfo containing passwords or
         formatted as telephone-subscribers.  Comparison of all other
         components of the URI is case-insensitive unless explicitly
         defined otherwise.
</code></pre>

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