Sony PCS-1 Operating Instructions Manual page 124

3
Use the V, v, B or b button on the Remote Commander to select "Send",
then press the PUSH ENTER button.
The motion picture on the monitor screen freezes, and a still picture is sent to
the remote party. The still picture remains even after sending.
To cancel the still image display on the answering site
Select "Clear", or switch the input picture.
124
Sending a Still Image