(The main functions of this system: 1. The maximum number of networked elevator entrances is 480; each elevator entrance has a maximum of 252 extensions, and the extended audio switcher can connect 508 extensions to each elevator entrance. 2. The elevator host calls the extension; the management core calls the extension; 3. The extension calls the management core, the management core displays the extension number; 4. When the management core is busy, it can temporarily store 10 incoming extension numbers; 5. The elevator host call management Core, the management core displays the elevator entrance number, and the management core unlocks by remote control; 6. The wall machine calls the extension or the management core, and the extension or the management core can issue an unlock command to the wall machine; 7. The management core can have off-hook conversations or hands-free conversations)
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