Yealink SIP-T48G - Manual (Page 137)

Advanced Phone Features
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3. Select Enabled from the pull-down list of Audio Alert for BLF Pickup.
4. Click Confirm to accept the change.
Note
When the monitored line receives an incoming call, the followings occur on the phone:

The phone plays a warning tone (if enabled).

The BLF key icon illuminates red and flashes.

The caller ID appears on the touch screen (if enabled).
In the following figure, the touch screen shows an incoming call from 2003 on the
monitored line.
When there is an active call on the IP phone, you can transfer the active call to the
monitored phone number directly by tapping the BLF key. The phone transfers the active
call differently depending on the transfer mode via DSS key. For more information on
performing call transfer, refer to
Call Transfer on page 111 .
Visual and audio alerts are configurable via web user interface only.