Abstract—The aim of the research is to design a portable wireless mesh networks based on IP PBX technology. The energy source of the system is supplied from the combination of solar cell and battery. The system employs Asterisk FreePBX software as a server configuration media while the clients, laptop and smartphone device, employ MicroSIP and Bria as a softphone. 13 concurrent calls perform 21.49% of CPU utilization, outperforming the previous research of around 70%. The results also describe that all the network performance parameters such us delay, jitter, and packet loss have met the ITU G.114 standards.