Snom Headset Compatibility Guide - Headsets Direct
VXi V150 Wireless Headset Bundle, vxi-203382 | Electronic Remote Answerer Included | For Snom IP Phones : 300, 320, 360, 370, 821, and 870 - Great clarity and reception with this cordless headset.
10 Snom 821 SIP VoIP Black 12-line Color Display Gigabit Phone Base Handset for sale online | eBay
Sennheiser Electronic Hookswitch for Snom 821 and 870 Phones