Siemens 600 Series - Manual (Page 114)

4–8 ROLMphone 300/600 User Guide
To turn off the
Mailbox status
light for a
message or
notification on a
non-display
telephone ➩ Get a dial tone.
➩ Dial # 5 2.
You will hear the confirmation tone. The
Mailbox status light turns off.
➩ Hang up.
Note
Turning off the Mailbox status light does not delete
messages or notifications.