Yealink SIP-T48G Administrator's Manual page 172

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
6. Enter the desired time interval in the Synchronism (15~86400s) field.
7. Click Confirm to accept the change.
To configure the NTP server and time zone via phone user interface:
1. Press Menu->Settings->Basic Settings->Time & Date->SNTP Settings.
2. Press
area from the Time Zone field.
The default time zone is "+8".
3. Enter the domain names or IP addresses in the NTP Server1 and NTP Server2 fields
respectively.
4. Press
Daylight Saving field.
If Automatic is selected, the Location field will appear.
5. Press
Location field.
6. Press the Save soft key to accept the change.
You can set the time and date manually when IP phones cannot obtain the time and
date from the NTP time server. The time and date display can use one of several
different formats.
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or , or the Switch soft key to select the time zone that applies to your
or , or the Switch soft key to select the desired value from the
or , or the Switch soft key to select the desired value from the