Htek UC924E User Manual page 176

If the Bluetooth headset has a PIN, you need to configure the PIN via web interface:
Default PIN is 0000.
1. Login the phone's webpage->Setting->Feature
2. Click the "Saveset" button to save the configuration
Answering Calls
How to answer an incoming call?
With the Bluetooth headset paired, press the multifunction key on the Bluetooth headset
to answer an incoming call.
How to Adjusting the Earphone Volume
How to adjust the earphone volume during a call?
With the Bluetooth headset paired, you can do the following:

Press the Volume key (+) on the Bluetooth headset to increase the volume.
Press the Volume key (-) on the Bluetooth headset to decrease the volume.

Press the Volume key (+) on the phone to increase the volume.
Press the Volume key (-) on the phone to decrease the volume.
How to Ending Calls
To end a call:
With the Bluetooth headset paired, press the multifunction key on the Bluetooth headset
to end a call.
Troubleshooting
BT Feature
176