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9780070097063 This up-to-the-minute reference helps telecommunications professionals gain a complete understanding of private branch exchange (PBX) systems with specific information on the architecture, design, and technology of these systems. Its comprehensive coverage includes: a thorough review of applicable technologies encompassing hardware, software, and firmware used in modern PBX systems; major feature groups available in modern PBX systems and a review of architectures to enhance PBX functionality; and PBX system management and administration guidelines.