Mitel PHONE 5215 - Manual (Page 30)

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To delete all missed, answered, or outgoing call logs:
1. After selecting the type of logs you wish to delete, press the # key
(Delete All).
2. Confirm that you do want to delete all items by pressing the * key (Yes).
To delete a particular call from the call log:
1. With the call log that you want to delete displayed, press the # key
(Options). The Options menu is displayed.
2. Press the # key (Delete) to delete the log.