3.1.7 Telecom / PBX (Private Branch Exchange)
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Your organizations telecommunications facilities are also part of its IT infrastructure. The PBX, or Private Branch Exchange, is the controller of the telephone network within an organization279. It coordinates access to a limited number of outside telephone lines, each of which has its own telephone number, by a greater number of inside lines within the company. PBXs are often used by medium and large-sized companies because its less expensive than connecting an outside line directly to each internal line. For example, a site might have 400 internal lines, or extensions, and 80 external lines. Another benefit of PBXs is that users within the organization can reach other users connected to the PBX by dialing their short (3 or 4 digit) extension rather than a full telephone number. Many PBXs contain what is known as a remote maintenance, or remote diagnostic, port that is used by the PBX vendor to reconfigure the phone system, upload and install software updates, download logs and perform other privileged operations. As you can see, a PBX is phone system server of sorts.
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