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Cisco SIP IP Phone 7960 Administrator Guide
78-10497-02
Chapter 3 Managing Cisco SIP IP Phones
Setting the Date, Time, and Daylight Savings Time
Table 3-2 Actions Based on sntp_mode When the sntp_server Parameter is Set to a Null Value
sntp_server
=0.0.0.0
sntp_mode=
unicast
sntp_mode=
multicast
sntp_mode=
anycast
sntp mode=
directedbroadcast
Sends
Nothing.
No known server
with which to
communicate.
Nothing.
When in multicast
mode, SNTP
requests are not sent.
SNTP packet to the
local network
address.
After the first SNTP
response is received,
the phone switches
to unicast mode with
the server being set
as the one who first
responded.
SNTP packet to the
local network
address.
After the first SNTP
response is received,
the phone switches
to multicast mode.
Receives
Nothing.
No known server
with which to
communicate.
SNTP data via the
SNTP/NTP
multicast address
from the local
network broadcast
address from any
server on the
network.
Unicast SNTP data
from the SNTP
server that first
responded to the
network broadcast
request.
SNTP data from the
SNTP/NTP
multicast address
and the local
network broadcast
address from any
server on the
network.