Aastra Telecom 41-001343-02 Dhcp Time Offset Option 2 Support, Country Name Country Code Dhcp

Operational Features

Example 2

The following is an example of a custom time zone configuration in the configuration files using absolute time:

time zone name: Custom

dst [startend] relative date: 0 #absolute

#start of DST

dst start month: 3 #March

dst start week: 2 #second full week

dst start day: 1 #Sunday

#End of DST

dst end month: 11 #November

dst end week: 1 #first full week

dst end day: 1 #Sunday

DHCP Time Offset (Option 2) Support

DHCP Option 42 enables the phone to be configured with the Network Time Protocol (NTP) server addresses. However, NTP provides the Coordinated Universal Time (UTC) time so the phone requires the offset from UTC in order to deliver the correct local time.

A User or Administrator can set the offset of UTC using DHCP Option 2.

An Administrator can enable Option 2 in the configuration files by setting the parameter “time zone name”. If this parameter contains the DP-Dhcpvalue, the phone derives the time and date from UTC and the time offset offered by the DHCP server.

Using the IP Phone UI, a User or Administrator can enable the phone to use DHCP Option 2 by setting the following val- ues from the Country Code list on the phone:

Country Name	Country Code
Dhcp	DP

Note:

The country name, country code, and time zone name are case sensitive.

On the IP Phone UI for 8 and 11-line phones, a User or Administrator can select Preferences->Time and Date->TimeZone->Othersand choose “DP-Dhcp” from the displayed time zone list.

On the IP Phone UI for 3-line phones, you select Preferences->Time and Date->TimeZone->Othersand enter “DP” for the country code, or press “*” and select “Dhcp” from the displayed time zone list.

On the 6739i, a User or Administrator can select Set Time->Timezone->Othersand choose “DP-Dhcp” from the dis- played time zone list.

If you enable DHCP Option 2 via the IP Phone UI, the change takes place dynamically.

Notes:

•When DHCP Option 2 is enabled on the phone, the phone still uses the values configured for Daylight Savings to control daylight savings time.

•The default behavior for the phone is to use the NTP server from Option 42 (or current configuration setting) and the current time zone settings.

•If the time zone name parameter is set to a value other than Dhcp, then DHCP Option 2 is disabled.

References

For more information about setting DP-DHCP for the timezone, see Appendix A, “Time Zone Name” on page A-41.

For more information about setting the country code, see Appendix A, “Country Codes (from Standard ISO 3166)” on page A-138.

5-18 41-001343-02 REV04 – 05.2014