Callers can use Leave Message (Feature 980) to leave a message for a subscriber or a Group List.
The caller must enter Feature 980 and the mailbox number. The call is
treated as a Call Answering call.
After the caller leaves a message they can leave another message or
log on.
If the target mailbox is:
an Information mailbox or Fax On Demand mailbox the call is treated as a call from the Auto Attendant. The mailbox message plays and the call disconnects.
a Group List, the caller does not hear a personal greeting and their message is sent to each member of the Group List.