![]() A Raspberry Pi 4 with at least 4GB of memory.As befits the age we live in, I’ll assume you're using a consumer-grade Internet connection, without a sophisticated firewall. While the 3CX PBX can be administered with a web browser, you will need a little IP networking knowledge and should feel comfortable with a Linux command line to perform the installation. It can be run in the cloud, or in our case, a computer not much bigger than a pack of playing cards. In contrast, this modern implementation with the Raspberry PI 4 can still work with telephone handsets, but is also designed to use web-based softphones and mobile clients. It would consist of a rack of equipment in a telephone closet, connected to the building wiring system, and administered by members of a technical priesthood. Traditionally, a PBX has served to connect the telephone handsets in an organization with the public switched telephone network (PSTN), providing features such as an operator station, voicemail, call forwarding and so on. I'm going to use the 3CX PBX (Public Branch eXchange) software, which is easy to administer and available as a free-to-use version for small deployments. ![]() ![]() If you're a hobbyist, a tech-savvy small business owner, or even a curious solutions engineer, what could be more fun than running your own phone system? In this post I will show you how to do just that using a $100 Raspberry Pi 4 computer connected to a Twilio Elastic SIP trunk. ![]()
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