Amazon.com: WirelessFinest Headset Headphones with Volume + Mute Control Replacement for Cisco SPA Series Spa303 Spa504g and Other, Polycom Soundpoint IP 320 330, Grandstream, Cortelco : Electronics
Amazon.com: TruVoice HD-150 Professional Headset with Noise Canceling Microphone and 2.5mm Adapter Compatible with Cisco SPA303, SPA502g, SPA504g, SPA508g, SPA509g, SPA514g, SPA525g and Phones with a 2.5mm Port : Electronics
Cisco SPA 303 3-Line IP Phone
PLANTRONICS HW540-SPA Cisco IP Phone Headset
Amazon.com: WirelessFinest Headset Headphones with Volume + Mute Control Replacement for Cisco SPA Series Spa303 Spa504g and Other, Polycom Soundpoint IP 320 330, Grandstream, Cortelco : Electronics
Cisco Compatible Plantronics Wireless VoIP Headset Bundle with Remote Answer - 84693-11 |For Cisco IP phones: 7932g, 7931, 7942g, 7945g, 7960g, 7965g, 7971g, 7975g, 7985g - Walmart.com
Amazon.com: TruVoice HD-150 Professional Headset with Noise Canceling Microphone and 2.5mm Adapter Compatible with Cisco SPA303, SPA502g, SPA504g, SPA508g, SPA509g, SPA514g, SPA525g and Phones with a 2.5mm Port : Electronics