Polycom VVX 500 series - How do I transfer a call if I dont need to talk to the recipient before I send the caller through (Blind transfer)?

Polycom VVX 500 / 510 / 600 / 610
Answer a Call > Ringing on Another Phone > Line Appearance
12
If you have an appearance of another line
on your phone you can answer calls
ringing on that line.
In this example the second line is x4019
After approx. 5 seconds, your onscreen display switches
to Calls view.
You see the caller ID and the line on which the call is
ringing.
Tap Answer to pick up
* This feature is configurable and may have been changed by your system administrator
By default* when the call first comes in, it
shows as a full onscreen display.
You see the caller ID and the line on which
the call is coming in.
Tap Answer to pick up