[SR-Users] Missing ACC record in case of canceled call forking

Hi All, I'm facing a strange problem of missing ACC record in case of parallel call forking. The scenario is the following:  - A subscriber with 1 device registered  - B subscriber with 2 device registered (B1 and B2) CASE 1:  - A calls B  - B1 and B2 start ringing  - A hangups the call before B1 or B2 answers Kamailio generates an ACC record. CASE 2:  - A calls B  - B1 and B2 start ringing  - B1 rejects the call sending back a 486  - B2 is still ringing  - A hangups the call before B2 answers Kamailio DOESN'T generate an ACC record. We have Kamailio v5.1.4 with TM module enabled. ACC configuration is the following:   modparam("acc", "early_media", 0)   modparam("acc", "report_ack", 0)   modparam("acc", "report_cancels", 1)   modparam("acc", "detect_direction", 1)   modparam("acc", "db_flag", 1)   modparam("acc", "db_missed_flag", 2)   modparam("acc", "failed_transaction_flag", 3) I increased debug level of TM and ACC modules and I added some debug lines as well. The difference between the two calls is that, after the CANCEL sent by A is processed by Kamailio, in CASE 1 I have the following lines:   Aug 28 14:21:11 spce proxy[13188]: DEBUG: tm [t_hooks.c:258]: run_trans_callbacks_internal(): DBG: trans=0x7f5a88049198, callback type 512, id 0 entered   Aug 28 14:21:11 spce proxy[13188]: DEBUG: acc [acc_logic.c:670]: tmcb_func(): acc callback called for t(0x7f5a88049198) event type 512, reply code 487   Aug 28 14:21:11 spce proxy[13188]: DEBUG: acc [acc_extra.h:63]: free_strar_mem(): Freeing memory, type is 2, message_index 8, index i 0   Aug 28 14:21:11 spce proxy[13188]: DEBUG: acc [acc_extra.h:63]: free_strar_mem(): Freeing memory, type is 2, message_index 8, index i 1   Aug 28 14:21:11 spce proxy[13188]: DEBUG: acc [acc_extra.h:63]: free_strar_mem(): Freeing memory, type is 2, message_index 8, index i 2   Aug 28 14:21:11 spce proxy[13188]: DEBUG: acc [acc_extra.h:63]: free_strar_mem(): Freeing memory, type is 2, message_index 8, index i 3   Aug 28 14:21:11 spce proxy[13188]: DEBUG: acc [acc_extra.h:63]: free_strar_mem(): Freeing memory, type is 2, message_index 8, index i 4 Those debug lines are not printed for CASE 2. Is there any configuration I'm missing or is it a bug? Thank you very much for your support. Marco