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Plantronics APD-80 EHS Electronic Hookswitch Adapter for NEC DT820, Grandstream GXP 1610, GXP1615, GXP1620, GXP1625, GXP1628, GXP1630, GXP1760, GXP1780, GXP1782, GXP2124, GXP2130, GXP2135, GXP2140, GXP2160, GXP2170, GXP2200, GXP3240, GXP3275, ShoreTel ...
