Yealink SIP-T21 - Manual (Page 61)

Customizing Your Phone
51
Usage: Press the DSS key to forward an incoming call to the number specified in the
Value field.
Note
Transfer
You can use this key feature to handle the call differently depending on the transfer
mode on DSS key when there is an active call on the phone.
Dependencies: Type (Key Event)
Key Type (Tran)
Value (the number you want to transfer to)
Usage:

When the transfer mode on DSS key is Blind Transfer, press the DSS key to complete
the blind transfer to the number specified in the Value field.

When the transfer mode on DSS key is Attended Transfer, press the DSS key to dial
out the number specified in the Value field, and then you can perform the attended
or semi-attended transfer.

When the transfer mode on DSS key is New Call, press the DSS key to place a new
call to the number specified in the Value field.
Note
Hold
You can use this key feature to place an active call on hold or retrieve a held call.
Dependencies: Type (Key Event)
Key Type (Hold)
Usage:
1. Press the DSS key during an active call to place the call on hold.
2. Press the DSS key again to retrieve the held call.
DND
You can use this key feature to activate or deactivate DND. You can also use this key
feature to access the custom DND interface. For more information, refer to
Do Not
Disturb (DND) on page 73 .
When you leave the Value field blank, the DSS key performs the same function as the
Fwd soft key when receiving an incoming call.
Transfer mode on DSS key is configurable via web user interface at the path
Features->Transfer->Transfer Mode Via Dsskey.
When you leave the Value field blank, the DSS key performs the same function as the
TRAN key or the Tran soft key during a call. For more information, refer to
Call Transfer on
page 82 .