Mitel 6800i Series Administrator's Manual page 268

Mitel 6800i Series SIP Phone Release 4.1.0 Administrator Guide
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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-Dhcp value, 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 values from the Country Code list on the phone:
COUNTRY NAME
Dhcp
Note: The country name, country code, and time zone name are case sensitive.
On the IP Phone UI for 6867i and 6869i IP phones, a User or Administrator can select Time
and Date->Time Zone->Others and choose "DP-Dhcp" from the displayed time zone list.
On the IP Phone UI for 6863i and 6865i IP phones, you select Preferences->Time and
Date->Time Zone->Others and enter "DP" for the country code, or press "*" and select "Dhcp"
from the displayed time zone list.
If you enable DHCP Option 2 via the IP Phone UI, the change takes place dynamically.
Notes:
1. When DHCP Option 2 is enabled on the phone, the phone still uses the values
configured for Daylight Savings to control daylight savings time.
2. 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.
3. 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,
Name" on page
5-22
A-44.
COUNTRY CODE
DP
"Time Zone