Polycom TransTalk 9000-Series - Manual (Page 348)

Feature Reference
5-238
4. Press f 0 4 .
5. Program another button for this extension or exit programming mode.
Using
To save a number, from a system phone, press the programmed button or
press
f 0 4 after dialing the number, but before hanging up.
To redial a stored number, press the programmed button again or
press
f 0 4 again.