The Poly U10P Lightweight Cable (784S1AA) connects a compatible phone to a headset, using a phone connector at one end and a Quick Disconnect audio connection at the other. It is a replacement cable identified with reference 38232-01.
Its 4 m length gives room to move around a desk while staying connected. The listed phone connector is RJ11, and the cable is black. This is a straightforward connection accessory for a phone and headset setup that uses the U10P cable type.