iE has very limited Answering supervision. Foe each call you should wait up to 5-6 sec, before iE detect that yhere are no Ring tone any more (if someone answer to call).
Flash Horizon/Vive offers some Dialers/LCR whic can detect Voice, so you should order Dialer for each FXS port and connect it to iE. So iE should send call to Dialesr and dialer will detect voice and this will make aceptable accuracy for CDR. Dialer should dent Reverse polarity as status when call is answered.
In IP script do not use Answer Connect.
use xdefault answerconnect ON