SIP Server Implementation and Performance on a Bare PC

We describe the implementation and performance of a bare PC SIP server that runs without the support of an operating system (OS) or kernel. A bare PC SIP server provides immunity against OS vulnerabilities and yields performance gains due to the elimination of OS overhead. We discuss server design focusing on its novel architectural features and illustrate key implementation aspects by examining relevant task and method invocations for SIP request processing. We also study bare PC SIP server performance by comparing its latency and throughput against two conventional OS-based SIP servers running on equivalent hardware: OpenSER on Linux and Brekeke on Windows. Furthermore, we measure internal bare PC SIP server performance by providing internal timings for the most significant operations associated with registration and proxy services. Additionally, we study performance under increasing server load by obtaining the execution time spent in the bare PC SIP handler method and the total processing time including network protocol processing overhead when processing SIP requests and responses. The results show that the bare PC server performs better than the OS-based servers in most cases and that its internal processing times are small as would be expected due to the elimination of OS overhead. The design and implementation details of the bare PC SIP server presented here give insight into understanding SIP server performance on a bare