<p></p>
<p>Thank you for your reply.</p>
<p>Does the manual somewhere state that set_contact_alias() should not be used for REGISTER?<br>
Actually, some examples suggest using this instead of fix_nated_contact()  - <a href="http://www.evaristesys.com/blog/server-side-nat-traversal-with-kamailio-the-definitive-guide/" rel="nofollow">http://www.evaristesys.com/blog/server-side-nat-traversal-with-kamailio-the-definitive-guide/</a></p>
<p>The reason for using set_contact_alias() instead of fix_nated_contact() is that one client seemed to have an issue with the contact being changed.</p>
<p>I'm actually using in on an edge proxy and already using Path,  but I guess I missed setting this on the edge: modparam("path", "use_received", 1)</p>
<p>Fixed it already temp with a subst on the reply for REGISTERs, as you wrote.</p>

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