Quality of Service Evaluation of a Trixbox-Based VoIP System at Sultan Iskandar Muda Meteorological Station, Banda Aceh

Abstract

Reliable voice communication is essential for supporting operational coordination in government institutions, particularly in meteorological services that require real-time information exchange. Voice over Internet Protocol (VoIP) has emerged as an efficient communication solution due to its low deployment cost and flexibility; however, its performance is highly dependent on wireless network quality. This study evaluates the Quality of Service (QoS) performance of a Trixbox-based VoIP communication system implemented at the Sultan Iskandar Muda Meteorological Station Banda Aceh. An experimental method with a quantitative approach was employed to measure five QoS parameters, namely throughput, delay, jitter, packet loss, and Mean Opinion Score (MOS). Packet data were captured using Wireshark under four testing scenarios based on two communication distances (10 m and 30 m) and two testing periods (morning and afternoon). The measured QoS parameters were evaluated according to the TIPHON and ITU-T standards. The experimental results show that increasing the communication distance leads to higher delay, jitter, and packet loss, while throughput and MOS tend to decrease, particularly for the client located farther from the access point. Nevertheless, the measured throughput remained above 75 kbps, delay was consistently below 150 ms, and most MOS values exceeded 4.0, indicating Good to Very Good voice quality. Overall, the Trixbox-based VoIP system demonstrated reliable communication performance under the evaluated operational conditions and satisfied the recommended QoS requirements for real-time voice communication. The findings provide practical guidance for deploying wireless VoIP systems in government institutions and contribute empirical evidence regarding VoIP performance in operational meteorological environments.