LevelOne VOI-7011 - Manual (Page 63)

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STUN Setting The STUN function must be enabled to
work properly behind NAT when
registered in SIP server. You may enter
the STUN server IP address and the
STUN port number. Please check your
ITSP for STUN information.
MWI Setting Message Waiting Indicator (MWI) in
telephony, is a Bellcore term for an
FSK-based telephone calling feature that
illuminates an LED on select telephones
to notify a telephone user of waiting
voicemail messages on public telephone
networks and PBXs.
When set to"On" a Subscribe for Message
Waiting Indication will be sent periodically.