3CX Advanced Training: 1.0 Security with 3CX (v14 SP3) Course 1.0 Security with 3CX In this course we will discuss: Various security mechanisms. For example the defining of the blacklist interval and allowed country codes. Manage the firewall for only “good” IP addresses. Upcoming webinars on this topic :There are no scheduled upcoming webinars on this topic at the moment. You can view the list of upcoming webinars here.