Clock (Date and Time) Synchronization Parameters

Defines the IP address (in dotted-decimal notation or as an FQDN) of the NTP server. The advantage of using an FQDN is that multiple IP addresses can be resolved from the DNS server, providing NTP server redundancy.

The default IP address is 0.0.0.0 (i.e., internal NTP client is disabled).

Defines a second NTP server's address as an FQDN or an IP address (in dotted-decimal notation). This NTP is used for redundancy; if the primary NTP server fails, then this NTP server is used.

The default IP address is 0.0.0.0.

Defines the time interval (in seconds) that the NTP client requests for a time update.

The default interval is 86400 (i.e., 24 hours). The range is 0 to 214783647.

Note: It is not recommend to set the parameter to beyond one month (i.e., 2592000 seconds).

Defines the NTP authentication key identifier for authenticating NTP messages. The identifier must match the value configured on the NTP server. The NTP server may have several keys configured for different clients; this number identifies which key is used.

The valid value is 1 to 65535. The default is 0 (i.e., no authentication is done).

Defines the secret authentication key shared between the device (client) and the NTP server for authenticating NTP messages.

The valid value is a string of up to 32 characters. By default, no key is defined.

Note: The parameter cannot be configured with wide characters.

Defines the Universal Time Coordinate (UTC) offset (in seconds) from the local time.

The valid range is -86400 (i.e., -24 hours) to 86400 seconds (i.e., +24 hours). The default is 0.

Note: The offset setting is applied only on the hour. For example, if you configure the parameter at 15:42, the device applies the setting only at 16:00.

For more information, see Configuring the Time Zone.

Enables daylight saving time (DST).

For more information, see Configuring Daylight Saving Time.

Defines the date and time when DST begins. This value can be configured using any of the following formats:

For example, "05:01:08:00" denotes daylight saving starting from May 1 at 8 A.M.

For example, "04:FRI/03:23:00" denotes Friday, the third week of April, at 11 P.M. The week field can be 1-5, where 5 denotes the last occurrence of the specified day in the specified month. For example, "04:FRI/05:23:00" denotes the last Friday of April, at 11 P.M.

Defines the date and time when DST ends. For a description of the format of this value, see the DayLightSavingTimeStart parameter.

Defines the DST offset (in minutes).

The valid range is 0 to 120. The default is 60.

Note: The offset setting is applied only on the hour. For example, if you configure the parameter at 15:42, the device applies the setting only at 16:00.

Enables the device to obtain its date and time for its internal clock from the SIP Date header in 200 OK messages received in response to sent REGISTER messages.

For more information, see Configuring Automatic Date and Time through SIP.