Design and Operation of Wi-Fi IP-PBX Device for Free Voice Calling System using Raspberry Pi

IP-PBX is a complete telephony system that provide the free cost, wireless IP data network. An internet protocol based on private branch exchange system consists of one or more SIP phones. Here we need a VOIP (Voice over internet protocol) server with the best open source framework "ASTERISK". An IP-PBX term function as proxy server which is dedicated server using Raspberry pi. A GSM dongle is used for the internal SIM facility for the work. By implementing the server we make a wireless communication in the range of WiFi. The SIP Client must register on IP-PBX server and when a user wish to call it asked the server to make connection. Raspberry pi server is used to handle call request and managing traffic through the platform. IP-PBX has a directory of the all users with their SIP address only those can connected and communicate the server. Also communications are made in between these users only. External traditional also be allowed using this system. IP-PBX can enable each and every person to an organization to be provided with voice extension, hence increase productivity which may easier to manage the routine operation. These no need to disturb current external communication infrastructure and operation since it use existing network.