Nortel Networks 2007 - Manual (Page 19)

Enter and edit text
Enter text using the USB keyboard
The USB keyboard, when connected, can be used to enter text in the
tools and graphical applications.
For number entry in telephone applications (for example, when dialing),
the keyboard may be used to enter digits (0-9), as well as * and #. Other
characters are ignored.
When on a call, the function keys (f1, f2, f3, f4, f5, f6, f7, and f8) can be
used to control the telephone. Table 3 shows the function keys and their
associated action during telephone calls.
Table 3: USB keyboard function keys during telephone calls
Function key Action
f1 Go to Handsfree mode
f2 Go to Headset mode
f3 Place the current call on Hold
f4 Mute the current call
f5 Volume Up
f6 Volume Down
f7 Copy
f8 Quit