Yealink SIP-T20 - Manual (Page 81)

Basic Call Features
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2. Enter the number you want to forward the incoming call to.
3. Press or .
The LCD screen prompts a call forwarded message.
You can transfer a call to another party in one of the three ways:

Blind Transfer: Transfer a call directly to another party without consulting.

Semi-Attended Transfer: Transfer a call when the target phone is ringing.

Attended Transfer: Transfer a call with prior consulting.
To perform a blind transfer:
1. Press during a call.
2. Enter the number you want to transfer the call to.
3. Press again to complete the transfer.
Then the call is connected to the number to which you are transferring.
To perform a semi-attended transfer:
1. Press during a call.
2. Enter the number you want to transfer the call to.
3. Press or to dial out.
4. Press to complete the transfer when receiving ringback.
To perform an attended transfer:
1. Press during a call.
Tran: 1234
123
FWD: 1234
123
FWD To 1234
12 Sep 10:53