PLANET VIP-350PT - Manual (Page 138)

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SNTP
Simple Network Time Protocol, SNTP, is used to acquire current date-time so as to synchronize the
date-time on the phone. Once assigned, the phone will try to synchronize the date-time with the
specified NTP server regularly and convert the returned GMT time to local time based on time zone and
daylight saving adjustment.
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Mode
The Simple Network Time Protocol is used to synchronize time with IP Phone. If you set SNTP server to
Anycast mode, the phone will send SNTP query to LAN broadcast address. Otherwise, it sends a
request to the specified SNTP / NTP server, extracting the reported time from the reply, and overwrites
the phone’s time. Typically, SNTP / NTP servers operating in broadcast mode send update messages
every 64 to 1024 seconds. The default time on system starting up is 00:00, January 1, 2007, GMT. If you
choose to disable SNTP, it will not synchronize current system time with NTP server, nor will it adjust
daylight saving time.
Default is Unicast
Unicast Multicast Anycast
Sends
SNTP request to the
specified SNTP server if
available. Nothing
When in multicast mode,
SNTP requests are not sent. SNTP packet to the local
network broadcast address,
224.0.1.1.
After the first SNTP
response is received, the
phone switches to unicast
mode with the server being
set as the one who first
responded.
Receives
SNTP response from the
SNTP server and ignores
responses from other SNTP
servers. SNTP data via the SNTP /
NTP multicast address from
the local network broadcast
address from any server on
the network.
The default multicast
address is 224.0.1.1. Unicast SNTP data from the
SNTP server that first
responded to the network
broadcast request.