Lucent Technologies PARTNER Advanced Communications System Programming And Use Instructions page 362

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 1
2. Press .
You hear intercom dial tone again.
3. Enter the four-digit code that you used to lock the extension.
You hear intercom dial tone again.
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.
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Feature Reference