Cisco 521 User Manual page 11

Your Headset
Call Device
Cisco IP Phone 8851, 8851NR, 8861, 8865,
and 8865NR
Cisco Webex DX70 and Cisco DX80
Cisco Jabber for Windows and Mac
Cisco Webex Meetings for Windows and Mac
Note
Your On-Premises administrator must enable electronic hookswitch for the Y-Cable to work with your Cisco
IP Phone.
Your headset buttons are used for basic call features.
Figure 3: Cisco Headset 561 and 562 Buttons
Firmware Requirements and Hardware Compatibility
On-Premises Firmware 12.1(1)SR1 or later (partial call
functionality with the Y-cable)
On-Premises Firmware 12.5(1) or later (full call functionality
with the USB or Y-cable)
Multiplatform Firmware 11.2.3 or later (USB only)
Cisco Webex DX Firmware 9.3 or later (USB only)
Cisco Jabber version 12.5 or later (with USB or Bluetooth)
Latest version of Cisco Webex Meetings (with USB or
Bluetooth)
Cisco Headset 500 Series User Guide
Cisco Headset 560 Series
5