Yealink SIP-T48G Administrator's Manual page 204

Microsoft Lync Edition Administrator's Guide for SIP-T2_Series and T4_Series IP Phones
Details of the Configuration Parameter:
Parameter
features.headset_training
Description:
Enables or disables dual headset feature.
0-Disabled
1-Enabled
If it is set to 1 (Enabled), users can use two headsets on one phone. When the IP
phone joins in a call, the users with the headset connected to the headset jack
have a full-duplex conversation, while the users with the headset connected to the
handset jack are only allowed to listen to.
Web User Interface:
Features->General Information->Dual-Headset
Phone User Interface:
None
To configure dual headset via web user interface:
1. Click on Features->General Information.
2. Select the desired value from the pull-down list of Dual-Headset.
3. Click Confirm to accept the change.
192
Permitted Values
0 or 1
Default
0