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Plantronics headset come with a QD quick disconnect connector or USB on some models. The QD plug will not connect directly to a phone and requires this adapter.
U10P-S QD (Quick Disconnect) to RJ9 adapter coil cable, compatible with specific Plantronics corded headsets and specific telephones with an RJ9 headset jack, Grandstream (all desk telephone models) and Yealink (all desk telephone models).