Real-time performance evaluation and stability testing of RasPBX for VoWiFi

VoWiFi or deployment of VoIP over wireless medium can facilitate campus-wide provisioning of IP-based voice service. Determining the performance and capacity limits is essential for proper dimensioning of the service in an enterprise. This paper analyzes the real-time performance of an economical RasPBX based Asterisk system for VoWiFi service in terms of voice capacity and quality. The call blocking probability serves as the voice capacity metric and the voice quality is assessed from network packet losses. Prediction of subscriber capacity from these parameters using Erlang-B model to ensure a scalable system deployment has also been outlined in this work.