<p>Hi, <a href="https://github.com/bogdan-iancu" class="user-mention">@bogdan-iancu</a>,</p>

<p>In my scenario, the UAC always registering to the registrar with the same call-id, which seems do not have any problems, according to the <a href="https://tools.ietf.org/html/rfc3261#section-10.2">rfc</a>.</p>

<p>But after a reboot(within the expire-time), the UAC then try to register with a very low CSeq with the same call-id, then the server rejects the registration. This, also, seems nothing wrong.</p>

<p>But then comes the problem, my UAC cannot register in a period of time according to it's previous expire-time.</p>

<p>So, must the UAC initiate a new call-id in the very every beginning? The <a href="https://tools.ietf.org/html/rfc3261">rfc</a> does not say anything about this.</p>

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