Sony IT-M602 - Manual (Page 33)

Using visual message waiting service
If you subscribe to your telephone company's message service which
includes this feature, the display will show that you have messages
waiting to be retrieved.
CHASE) Display
If you have messages
"MESSAGE WAITING" will appear
on the display.
This display will be cleareci when you
retrieve your messages.
Note
You cannot use thi.s feature, if you have not subscribed to your telephone
company's message service.
For details on the availability of this service, please ask your telephone
company.
To erase "MESSAGE WAITING" on the display
If "MESSAGE WAITING" remains on the display, press ( ERASE).
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Features 33 "