Polycom Conference Phone Owner's Manual page 34

Enter a number to forward all future incoming calls to when you
are already in another call.
Press the Enable soft key.
4.
If you selected the forwarding type Always, a moving arrow
displays on the idle screen next to the directory number.
To disable call forwarding:
From the idle screen, press the Forward soft key.
1.
The Forwarding Type Select screen displays, showing the
forwarding type that is enabled.
The following screen shows the forwarding type "Always"
enabled.
Scroll to the forwarding type you want to change, and
2.
then press
A screen displays showing the details of the forwarding type you
want to disable.
To turn off call forwarding, press the Disable soft key.
3.
.