Version 6.4 95 March 2012
SIP User's Manual 9. Date and Time
9 Date and Time
The date and time of the device can be configured manually or it can be obtained
automatically from a Simple Network Time Protocol (SNTP) server.
9.1 Configuring Manual Date and Time
The date and time of the device can be configured manually.
The Regional Settings page allows you to define and view the device's internal date and
time.
To configure the device's date and time:
1. Open the Regional Settings page (Configuration tab > System menu > Regional
Settings).
Figure 9-1: Regional Settings Page
2. Enter the current date and time in the geographical location in which the device is
installed.
3. Click the Submit button; the date and time are automatically updated.
Notes:
• If the device is configured to obtain the date and time from an Simple
Network Time Protocol Support (SNTP) server, the fields on this page
display the received date and time and are read-only.
• After performing a hardware reset, the date and time are returned to their
defaults and therefore, should be updated.
9.2 Configuring Automatic Date and Time through SNTP
Server
The Simple Network Time Protocol (SNTP) client functionality generates requests and
reacts to the resulting responses using the NTP version 3 protocol definitions (according to
RFC 1305). Through these requests and responses, the NTP client synchronizes the
system time to a time source within the network, thereby eliminating any potential issues
should the local system clock 'drift' during operation. By synchronizing time to a network
time source, traffic handling, maintenance, and debugging become simplified for the
network administrator.
The NTP client follows a simple process in managing system time: the NTP client requests
an NTP update, receives an NTP response, and then updates the local system clock based
on a configured NTP server within the network.
The client requests a time update from a specified NTP server at a specified update
interval. In most situations, this update interval is every 24 hours based on when the
system was restarted. The NTP server identity (as an IP address) and the update interval
are user-defined (using the ini file parameters NTPServerIP and NTPUpdateInterval
respectively), or an SNMP MIB object (refer to the Product Reference Manual).
When the client receives a response to its request from the identified NTP server, it must
be interpreted based on time zone or location offset that the system is to a standard point
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