How to check if a normalization rule is taken into account ?
For this, the easiest way is to make a test call and look at the kamailio debug:
To access the specific logs of a call, it is necessary to filter the syslog file with the call-id of the SIP dialog (capture the flow with tool like sngrep or sipcapture):
# less /var/log/syslog | grep moncall-id
Replace moncall-id with the call-id of your SIP dialog.