User Guide for the SIP-T23P/G IP Phone 
66 
You can use two headsets when enabling dual headset. 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. 
2.  Select Enabled from the pull-down list of Dual-Headset. 
 
3.  Click Confirm to accept the change. 
Note 
There are two types of DSS keys: Line Keys and Programable Keys. The details will be 
introduced in the following. The SIP-T23P/G IP phone supports 3 line keys and 11 
programable keys. For more information on DSS key icon indicators, refer to Icon 
Instructions on page 12. 
You can assign predefined functionalities to line keys. You can also define a label for a 
line key feature which will appear on the LCD screen. Line keys allow you to quickly 
access features such as recall and voice mail. The line key LEDs will indicate the 
Dual headset is configurable via web user interface only.