Yealink SIP-T2 SERIES Administrator's Manual page 206

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
2. Select the desired value from the pull-down list of NTP by DHCP Priority.
3. Click Confirm to accept the change.
To configure the NTP server, time zone via web user interface:
1. Click on Settings->Time & Date.
2. Select Disabled from the pull-down list of Manual Time.
3. Select the desired time zone from the pull-down list of Time Zone.
4. Select the desired location from the pull-down list of Location.
5. Enter the domain name or IP address in the Primary Server and Secondary Server
field respectively.
6. Enter the desired time interval in the Synchronism (15~86400s) field.
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