Yealink (YHS34 Dual for 3rd Party)Wideband Headset Compatible with Cisco 79xx IP Phones,Avaya callmaster V and VI
"Wideband Headset Compatible with Cisco 79xx IP Phones,Avaya callmaster V and VI(Mod plug wiring:R,M-,M+,R) • Binaural Ear (dual ear) • Quick-disconnect (QD) cord • RJ9 Headset Jack • Hearing Protection • Leather Ear Cushions"