Polycom TransTalk 9000-Series - Manual (Page 367)

Station Lock (F21)
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4. Re-enter the four-digit code.
If the code entered in Step 4 matches the code entered in Step 3, you hear
silence. The extension is locked.
If the code entered in Step 4 does not match the code entered in Step 3,
you hear fast busy tone and the extension remains unlocked. Repeat the
locking procedure above.
To unlock a standard touch-tone phone:
1. Lift the handset.
You hear intercom dial tone.
2. Press # 2 1 .
You hear intercom dial tone again.
3. Enter the four-digit code that you used to lock the extension.
If the code entered in Step 3 matches the code used to lock the extension,
you hear silence and the extension is unlocked.
If the code entered in Step 3 does not match the code used to lock the
extension, you hear fast busy tone and the extension remains locked.
Repeat the unlocking procedure above.