During a call, press the Trnsfr soft key (the active call is placed on hold). Dial the number to which you want to transfer the call.
Use the arrow keys to access speed dial numbers, missed, placed, and received call lists. From one of these lists, press the Dial soft key. Press the Trnsfr soft key again to complete the transfer. This can be done as soon as the ringback sound is heard or you can wait until the third party answers and talk to them before completing the transfer.