Cisco Systems, Inc. HS-W-321-C-RJ9 headset

Cisco Headset 321 RJ9 wired mono headset

The Cisco Headset 321 is a wired, single-ear on-ear headset with a carbon black finish. It connects through an RJ-9 interface and is built for PC, Mac and Cisco IP phone use in office and conferencing environments. The supra-aural form factor keeps one ear open while the integrated uni-directional microphone captures speech clearly.

RJ-9 interface limits use to compatible desk

The headset uses an RJ-9 host interface and a 6.56 ft cable, so it plugs directly into supported Cisco IP phone models such as the 6800, 7800 and 8800 series, as well as Webex Desk and Wireless Phone 800 series devices. It also works with soft clients including Cisco Jabber, Webex App, Webex Meetings and Microsoft Teams when the host device provides an RJ-9 port. Users without an RJ-9 jack on their computer or phone cannot connect this headset without a separate adapter.

Single-ear design suits users who must stay aware

The on-ear, binaural earpiece with a 1.18 inch driver delivers stereo sound across a 50 Hz to 18 kHz range at 32 Ohm impedance. Weighing approximately 2.89 oz, the lightweight frame and ergonomic design aim to reduce fatigue during long calls. Buyers who need two-ear coverage for immersive audio or passive noise isolation should consider a dual-ear model instead.