<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/users/miconda/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/miconda">@miconda</a></p>
<p>I'm sorry to write in this already closed issue, but I have a problem related to the fixes implemented to solve this problem.<br>
In particular I would like to ask you why, in case of TOPOS module enabled, the Contact is a mandatory header for 183 messages as implemented in commit <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/kamailio/kamailio/commit/416d79b462986317f2c3a3ed8aa30a502d116095/hovercard" href="https://github.com/kamailio/kamailio/commit/416d79b462986317f2c3a3ed8aa30a502d116095"><tt>416d79b</tt></a>.<br>
>From RFC the Contact header is optional for all the 1xx reply messages.</p>
<p>I don't have any issue when I receive 183 messages without Contact header if TOPOS module is disabled. When I enabled it, instead, I fall in the mentioned check.</p>
<p>Thanks</p>

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