Amazon.com: Mono Call Center Headset Headphone with Mic for Cisco Unified Telephone IP Phones 7940 7941 7942 7945 7960 7961 7962 7965 7970 and Plantronics M10 MX10 Vista Modular Adapters : Electronics
PLANTRONICS HW540-CIS Cisco IP Phone Headset 88828-01-CIS