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How to build a Private phone network on VOIP using Asterisk PBX with Raspberry Pi and Mobile client

There was a need for an Organisation to build a phone network for use by their employees. Unlike the yester-years where telephony was analog and it required switching exchanges to route calls. The Govt or large corporations would set up Private Branch Exchanges (PBX) for this function. Now a days calls can be made digitally on the internet itself given that a server can appropriately route them to their chosen destinations. Voice over IP is used to digitally transmit packets over IP on the network to enable calling. There is a need for a VOIP server and clients that can talk to each other just like the old phone network. This can be easily achieved using robust opensource tools. Asterisk is an opensource PBX that has been around for a long period of time. Asterisk is an open source framework for building communications applications. Asterisk turns an ordinary computer into a communications server. Asterisk powers IP PBX systems, VoIP gateways, conference servers and other custom soluti...