Cisco Systems IP phone 7960 manual Sntp/Ntp

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	sntp_mode=	sntp_mode=	sntp_mode=	sntp mode=
=0.0.0.0	unicast	multicast	anycast	directedbroadcast
Sends	Nothing.	Nothing.	SNTP packet to the	SNTP packet to the
	No known server	When in multicast	local network	local network
			address.	address.
	with which to	mode, SNTP
	communicate.	requests are not sent.	After the first SNTP	After the first SNTP
			response is received,	response is received,
			the phone switches	the phone switches
			to unicast mode with	to multicast mode.
			the server being set
			as the one who first
			responded.
Receives	Nothing.	SNTP data via the	Unicast SNTP data	SNTP data from the
	No known server	SNTP/NTP	from the SNTP	SNTP/NTP
		multicast address	server that first	multicast address
	with which to
		from the local	responded to the	and the local
	communicate.
		network broadcast	network broadcast	network broadcast
		address from any	request.	address from any
		server on the		server on the
		network.		network.

	Cisco SIP IP Phone 7960 Administrator Guide
78-10497-02		3-23