Aastra Dialog 4223 Professiona User Manual page 114

Accessories
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Headset - Dialog 4223 Professional
How to install the headset, see section "Installation" on page 119.
The following headset functions are available.
Activate/Deactivate the headset
Press the Headset key to activate/deactivate.
See section "Description" on page 6. All calls can be handled via
the headset.
Answer calls
Press the flashing Line key to answer.
Press to terminate a Headset call.
z
Make calls
Enter the number.
Press to terminate the call.
Headset to handset
Lift the handset.
Handset to headset
Press the Headset key.
BusinessPhone — Dialog 4223 Professional / Dialog 3213