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Polycom Vvx Color Expansion ModuleVvx Color Expansion ModuleFeatures of Polycom Vvx Color Expansion Module Compatibe with VVX 300 VVX 310 VVX 400 VVX 410 VVX 500 and VVX 600 28 multifunctional line keys configurable as line registration call appearance speed dial DSS or BLF Dual color illuminated LEDs for line status informationSpecification of Pol..