Yealink SIP-T20 - Manual (Page 92)

User Guide for the SIP-T20P/SIP-T20 IP Phone
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6. Enter the phone number you want to monitor in the Value field.
7. (Optional.) Enter the pickup code in the Extension field.
8. Press to accept the change.
BLF key is configurable via web user interface at the path DSSKey->Line Key.
You can enable audio alert for BLF pickup on the phone. This allows the monitoring
phone to play a warning tone when the monitored line receives an incoming call.
To enable audio alert via web user interface:
1. Click on Features->Call Pickup.
2. Select Enabled from the pull-down list of Audio Alert for BLF Pickup.
3. 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 LED flashes.
When there is an active call on the IP phone, you can transfer the active call to the
monitored phone number directly by pressing the BLF key. The phone transfers the
active call differently depending on the transfer mode on DSS key. For more information
on the transfer mode on DSS key, refer to transfer in the
DSS Keys section on page 37 .
Audio alert is configurable via web user interface only.