User Guide for the SIP-T28P IP Phone 
52 
2.  Select Enabled from the pull-down list of Headset Prior. 
 
3.  Click Confirm to accept the change. 
To use headset prior, you should activate the headset mode in advance: 
1.  Physically connect the headset. 
2.  Press            to activate the headset mode. 
Note   
You can use two headsets when dual headset feature is enabled. To use this feature, 
you must physically connect headsets to the headset jack and handset jack respectively. 
Once the phone connects to a call, the headset connected to the headset jack will have 
full-duplex capabilities, while the one connected to the handset jack will only be able to 
listen. 
To enable dual headset via web user interface: 
1.  Click on Features->General Information.   
If headset prior is enabled, the headset mode will not be deactivated until you press the 
HEADSET key again. 
If headset prior is disabled, the headset mode can be deactivated by pressing the 
speakerphone key or the HEADSET key. 
Headset prior is configurable via web user interface only.