Cisco IP Phone SPA 504G Telephone Headset - EAR510
NEW Sale 2.5mm Plug office headset Anti noise Headphones with 2.5mm plug for Cisco Linksys SPA501G SPA502G SPA504G GIGASET|switch transmitter|switch semiconductorswitch lan - AliExpress
Cisco SPA504G IP Deskphone
Headset Headphones with Volume + Mute Control for Cisco SPA Series Spa303 Spa504g and Other, Polycom Soundpoint IP 320 330, Grandstream - Walmart.com
2.5mm Plug office headset Anti noise Headphones with 2.5mm plug for Cisco Linksys SPA501G SPA502G SPA504G 525G SPA921 GIGASET|office headset|headphone headphoneheadset headphone - AliExpress
Plantronics CS500 Wireless Headset for Cisco SPA 500 Series IP Phones
Cisco APC-45 EHS Cable for Plantronics Headsets
Jabra Biz 2300 Duo Cisco SPA 303, 5xx, 9xx Certified Headset