Hi, Im not sure if this helps you with that problem but I noticed that when I use acc_json, I needed to enable cdr also in the acc—module. So try to add modparam("acc", "cdr_enable", 1) and see if it helps. -Pyry *From: *sr-users &lt;sr-users-bounces(a)lists.kamailio.org&gt; on behalf of Alexis Prodhomme &lt;alexis.prodhomme(a)sewan.fr&gt; *Date: *Friday, 7. October 2022 at 12.53 *To: *sr-users(a)lists.kamailio.org &lt;sr-users(a)lists.kamailio.org&gt; *Subject: *[SR-Users] cannot register ACC CDR JSON engine when using acc_json module Hi everyone, I have some troubles using acc_json module. I can't load it and I don't understand why it fails. The configuration is quite basic: Debian 10 and Kamailio (fails in 5.5 and 5.6) installed using APT repository. Here is parts of my config: loadmodule "kex.so" loadmodule "corex.so" loadmodule "tm.so" loadmodule "tmx.so" loadmodule "rr.so" loadmodule "pv.so" loadmodule "dialog.so" loadmodule "acc.so" loadmodule "acc_json.so" modparam("acc_json", "cdr_enable", 1) I also tried with those 4 additionnal settings with no success: modparam("acc_json", "cdr_output_syslog", 1) modparam("acc_json", "cdr_log_facility", "LOG_LOCAL3") modparam("acc_json", "cdr_enable", 1) modparam("acc_json", "cdr_expired_dlg_enable", 1) As soon as I set cdr_enable to 1, it displays the "*cannot register ACC CDR JSON engine*". Here is logs: 0(2488) DEBUG: <core> [core/sr_module.c:969]: init_mod(): acc_json 0(2488) DEBUG: <core> [core/sr_module.c:722]: find_mod_export_record(): found export of <bind_acc> in module acc [/usr/lib/x86_64-linux-gnu/kamailio/modules/acc.so] 0(2488) INFO: acc_json [acc_json_mod.c:159]: mod_init(): janson version : 2.12 0(2488) DEBUG: <core> [core/mem/q_malloc.c:374]: qm_malloc(): qm_malloc(0x7f0a6b154010, 56) called from acc: acc_mod.c: acc_register_engine(725) 0(2488) DEBUG: <core> [core/mem/q_malloc.c:419]: qm_malloc(): qm_malloc(0x7f0a6b154010, 56) returns address 0x7f0a6b220b40 frag. 0x7f0a6b220b08 (size=56) on 1 -th hit 0(2488) DEBUG: acc_json [acc_json_mod.c:269]: acc_json_init():  init ... 0(2488) DEBUG: acc [acc_mod.c:741]: acc_register_engine(): new acc engine registered: json 0(2488) DEBUG: <core> [core/sr_module.c:722]: find_mod_export_record(): found export of <load_dlg> in module dialog [/usr/lib/x86_64-linux-gnu/kamailio/modules/dialog.so] 0(2488) ERROR: acc_json [acc_json_mod.c:245]: mod_init(): cannot register ACC CDR JSON engine 0(2488) ERROR: <core> [core/sr_module.c:974]: init_mod(): Error while initializing module acc_json (/usr/lib/x86_64-linux-gnu/kamailio/modules/acc_json.so) ERROR: error while initializing modules May it be related to the Jansson version ? I use the native one from Debian 10, v2.12. Do you have any advice, or some tips to debug my issue ? I don't really want to use acc module and parse CDRs manually from syslog, json is far easiest for this job. Thank you -- Alexis R&D Sewan