  Plantronics Headsets for Cisco 500-Series IP Phones SPA 501G, 502G, 504G, 508G, 509G, 525GFor your Cisco IP phone model SPA 501G, 502G, 504G, 508G, 509G or 525G, simply select any Plantronics H-series headset (click below) along with the special 2.5mm shielded connector cable (part# 64279-02, also referred to as 48586-03) below. No external amplifier base needed. You may want to also include an extension cable since the connector cord is fairly short.
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