Yealink SIP-T21 - Manual (Page 107)

Advanced Phone Features
97
In the following figure, the LCD screen shows an incoming call from 2020 on the
monitored line.
Note
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 46 .
You can record calls by pressing a record key on the phone. The SIP-T21P/SIP-T21 IP
phone supports record and URL record.
Two ways of call recording:

Record: The phone sends SIP INFO message containing a specific header “Record:
on/off” to trigger a recording.

URL Record: The phone sends HTTP URL request to trigger a recording. Contact
your system administrator for the predefined URL.
Note
To configure a record key via phone user interface:
1. Press Menu->Features->DSS Keys.
2. Select the desired DSS key.
3. Press or , or the Switch soft key to select Key Event from the Type field.
Call record is not available on all servers. Contact your system administrator for more
information.
If your phone is locked and the type of the keypad lock is configured as Function key or
All Keys, you cannot use the Pickup,
Send , NewCall and Cancel soft keys until unlocked.