Avalle Headset with Connection Cable & Noise Cancelling Microphone | Fully Compatible with Cisco SPA504G and more - see description : Amazon.co.uk: Electronics & Photo
Plantronics M214i 3-in-1 VoIP Headset for Cisco SPA504G SPA941 SPA942 SPA962 IP 840356869612 | eBay
Plantronics M214i 3-in-1 VoIP Headset for Cisco SPA504G SPA941 SPA942 SPA962 IP 840356869612 | eBay
Cisco SPA504G IP Headset | Cisco SPA504G Headset | Cisco SPA504G Switchable Headset | Headset Store