Samsung SVMi-4 - Manual (Page 19)

Keyset User Features
The following options are available if you have a DCS keyset. They require setup
by the system administrator.
Message Waiting Lights
When a new message is left in your mailbox, the voice mail message light on
your keyset will flash. Press this flashing key and follow the prompts to retrieve
messages.
Answer Machine Emulation
If you have an Answer Machine Emulation key programmed on your keyset, you
can use it to monitor calls going to your voice mail, and optionally answer
them. The operation of this feature is similar to screening a call on a home
answering machine.
Your keyset must be set to forward on no answer to voice mail. After ringing
your station the caller will be connected to voice mail and hear your personal
greeting before leaving a message. During this time you will be monitoring the
connection between the caller and your voice mailbox. You can pick up the call
at any time or ignore it.
Keyset User Features - Page 15