Yealink SIP-T2 SERIES Administrator's Manual page 204

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Parameters
local_time.ntp_server2
Description:
Configures the IP address or the domain name of the NTP server 2.
If the NTP server 1 is not configured or cannot be accessed, the IP phone will request
the time and date from the NTP server 2.
For SIP VP-T49G/CP860:
The default value is cn.pool.ntp.org.
For SIP-T48G/T46G/T42G/T41P/T40P/T29G/T27P/T23P/T23G/T21(P) E2/T19(P) E2:
The default value is pool.ntp.org.
Example:
local_time.ntp_server2 = 192.168.0.6
Web User Interface:
Settings->Time & Date->Secondary Server
Phone User Interface:
Menu->Settings->Basic Settings->Time & Date->SNTP Settings->NTP Server2
local_time.interval
Description:
Configures the interval (in seconds) to update time and date from the NTP server.
Example:
local_time.interval = 1000
Web User Interface:
Settings->Time & Date->Synchronism (15~86400s)
Phone User Interface:
None
local_time.time_zone
182
Permitted Values
IP address or domain
name
Integer from 15 to 86400
-11 to +14
Default
Refer to the
following content
1000
+8