Yealink SIP-T28P - Manual (Page 66)

User Guide for the SIP-T28P IP Phone
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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
Three types of DSS keys: Memory Keys, Line Keys and Programmable Keys. The details
will be introduced in the following. The use of line keys and memory keys are almost the
same. The SIP-T28P IP phone supports 10 memory keys and 6 line keys.
You can assign predefined functionalities to the memory keys located on the right of the
Dual headset is configurable via web user interface only.