Yealink SIP-T42G - Manual (Page 56)

User Guide for the SIP-T42G IP Phone
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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 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.
If headset prior is enabled, the headset mode will not be deactivated until you press the
Headset key again.
Headset prior is configurable via web user interface only.