There is a bug "Evapi module is not broadcasting any data" in evapi in kamailio43 which was fixed in kamailio44. ref:http://lists.sip-router.org/pipermail/sr-users/2016-August/094249.html
ref: Daniel on Kamailio users list : "It should be fixed now in the latest 4.4 and master branches. Cheers,Daniel"