from my post http://sip-router.org/tracker/index.php?do=details&task_id=448 <q> "Comment by Savolainen Dmitri (snen) - Friday, 04 July 2014, 12:55 GMT Yes, it is about adding the same record twice, but it doesn't matter via kamctl or via sip-endpoint. Just kamctl with permanent registration is more clearly, because there is no expire. Same update with expire will try to INSERT until expired (or adding not same record)" </q> You've fixed only MI part, but dynamic registration from endpoints in the usrloc record may be marked as CS_DIRTY with modparam("usrloc", "db_check_update", 1) and will be never CS_SYNC up to kamailio reboot or registration changed. So we can see multiple "Duplicate entry" message every <a href="http://www.kamailio.org/docs/modules/4.2.x/modules/usrloc.html#usrloc.p.timer_interval">timer_interval</a> period. You can see my fixing suggestions in the initial post of http://sip-router.org/tracker/index.php?do=details&task_id=448
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