<p><b>@sergey-safarov</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/kamailio/kamailio/pull/1927#discussion_r275282498">src/modules/tls/utils/openssl_mutex_shared/README.md</a>:</p>
<pre style='color:#555'>> +## Usage ##
+
+Use LD_PRELOAD to tell the linker to preload this shared object before starting
+Kamailio.
+
+Example, when Kamailio was installed from sources:
+
+```
+LD_PRELOAD=/usr/local/lib64/kamailio/openssl_mutex_shared/openssl_mutex_shared.so; \
+  /usr/local/sbin/kamailio -f /usr/local/etc/kamailio/kamailio.cfg
+```
+
+If using systemd, add to service file:
+
+```
+Environment='LD_PRELOAD=/usr/local/lib64/kamailio/openssl_mutex_shared/openssl_mutex_shared.so'
</pre>
<p>Hi Daniel<br>
Is need to do same action when kamailio packaged and located at /usr/sbin/kamailio</p>

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