Mitel 5205 IP Phone - Manual (Page 14)

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Callback
To leave a callback message at another extension:
z
While listening to ringing or busy tone, press the CALL ME BACK key.
The called extension user is informed of the message waiting indication by
their Message Indicator flashing and the display screen showing
"MESSAGE WAITING".
Callback - Cancel
To cancel a callback:
1. Lift the handset.
2. Dial *1#.
3. Dial the number of the called extension.
4. Hang up.
Callback - Cancel All
To cancel all callbacks:
1. Lift the handset.
2. Dial #1.
3. Hang up.