Plantronics 2.5mm Quick Disconnect (QD) 18" cable allows any Plantronics H-series headsets to be used with Cisco Linksys SPA 303, 501G, 502G, 504G, 508G, 509G or 525G, SPA921, SPA922, SPA941, SPA942, SPA962, SPA921, SPA922, SPA941, SPA942 phones with a 2.5mm jack. This special shielded cable is built specially for Cisco SPA phones "buzzing" sounding using a Plantronics headset.
Also used as the bottom cable for Spectralink phones.
Note: 64279-02 is same as 48586-03. Also know as the Spectralink 2.5mm cable.