The Linux philosophy is 'Laugh in the face of danger'. Oops. Wrong One. 'Do it yourself'. Yes, that's it.
While this is a brief chapter, it is very important. This chapter introduces you first to the traditional PBX systems we've used in enterprise networks for years and then to the modern hybrid and fully IP PBX solutions. Understanding the different components that make up a PBX system is a first step to understanding modern converged networks. The PBX solutions allow you to, in the words of Linus, "Do it yourself."
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