Yealink SIP-T4X Administrator's Manual page 214

Administrator's Guide for SIP-T4X IP Phones
2. Select the desired value from the pull-down list of Headset Prior.
3. Click Confirm to accept the change.
Dual headset allows users to use two headsets on one IP phone. To use this feature,
users need to physically connect two headsets to the headset and handset jacks
respectively. Once the phone connects to a call, the user with the headset connected to
the headset jack has full-duplex capabilities, while the user with the headset connected
to the handset jack is only able to listen.
Procedure
Dual headset can be configured using the configuration files or locally.
Configuration File
Local
198
<y0000000000xx>.cfg
Web User Interface
Configure dual headset.
For more information, refer to
Dual Headset on page 366.
Configure dual headset.
Navigate to:
http://<phoneIPAddress>/servlet
?p=features-general&q=load