Sony PCS-TL50 Operating Instructions Manual page 204

5
When the remote party answers, inform that party that you are transferring
a call, and then press the CONNECT/DISCONNECT (
the Remote Commander.
The call is transferred and the launcher menu is restored on the display of the
local system.
To cancel call transfer
Select "Cancel" from the submenu and press the ENTER button on the Remote
Commander.
Note
You can cancel call transfer only before the destination remote party answers. To
cancel call transfer after the destination remote party has answered, ask the remote party
to disconnect the line.
204
Starting a Videoconference Using SIP
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