Research on threat analysis and defense strategies for PABX voice server

Abstract

The evolution of Cloud-PABX calling architecture introduced a revolutionary development in voice communication architecture, and this solution is receiving discernible attention because of its long-distance remote branch calling facility. Currently, an employee at one company can contact another employee who is located in a different location branch office by simply dialing the desired extension number. However, interbranch calling is essential, but present cloud pabx solutions relies on public IP address to interconnect different locations voice calling. All attacks on the server, such as ICMP attacks, denial of service (DoS) attacks, unauthorized entry, eavesdropping, interception of VoIP traffic, and UDP flooding attacks, come targeting that public IP, which creates a strong security threat. To overcome the challenge, we developed a secured network architecture where our pabx server can connect to a remote branch office without using a public IP. The unique thing about our work is that we used local IP as a server signaling IP and introduced the tunnel protocol for connecting long-distance remote branch calls. Then we evaluated the