Yealink SIP-T54S Administrator's Manual page 876

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
Details of the Configuration 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.
Note: It works only if the value of the parameter "features.headset_mode.enable" is set to
1 (Enabled). It is not applicable to CP860/CP920 IP phones.
Web User Interface:
Features->General Information->Dual Headset
Phone User Interface:
None
To configure dual headset via web user interface:
Click on Features->General Information.
1.
Select the desired value from the pull-down list of Dual Headset.
2.
Click Confirm to accept the change.
3.
850
Parameter Permitted Values
0 or 1
Default
0