VoIP is the most widely used standard in the communication industry due to various reasons such as more flexibility, scalability, less complexity and cost-effectiveness. However, just as with any technology, VoIP has its own set of challenges. Besides quality of communication, security is one of the primary concerns in the IP infrastructures, but thanks to Session Border Controllers that not only improve the quality of the conversations but also act like firewalls to the VoIP networks, i.e. ensure security as well.<\/p>\n