ZyXEL Communications P-2602R-D1A Support Notes page 127

Prestige 2602R-D1A Support Notes
MWI
Message Waiting Indication is a common feature of telephone networks. It typically involves an audible or
visible indication that messages are waiting, such as playing a special dial tone (which in telephone networks is
called message-waiting dial tone), lighting a light or indicator on the phone, displaying icons or text, or some
combination these.
Enable Message Waiting Indication (MWI) enables your phone to give you a message–waiting (beeping) dial
tone when you have a voice message(s). Your VoIP service provider must have a messaging system that sends
message waiting status SIP packets as defined in RFC 3842.
MWI Call flow:
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