Panasonic 2-LINE KX-TG9551 Series Operating Instructions Manual page 53

R Call sharing is only available for the line
selected in the line selection mode (page 17).
n While your headset is on a landline call:
To join the conversation with the handset, press
ML1N or ML2N.
Adjusting your headset receiver volume
Base unit
Press MDN or MCN repeatedly while using your
headset.
Note:
R Depending on your headset, the receiver
volume may not be adjustable.
For assistance, please visit http://shop.panasonic.com/support
KX-TG954x_955x_OI(en)_0507_ver432.pdf 53
Using Bluetooth Devices
2018/05/07 14:00:44
53