Yealink CP969 Administrator's Manual page 226

Administrator's Guide for SIP-T5 Series Smart Media Phones
Example 1:
To modify the DST settings for the existing time zone "+5 Pakistan(Islamabad)" and add
DST settings for the existing time zone "+5:30 India(Calcutta)".
Example 2:
Add a new time zone (+6 Paradise) with daylight saving time 30 minutes.
Save this file and place it to the provisioning server (e.g., 192.168.1.100).
3.
Specify the access URL of the AutoDST file in the configuration files.
4.
Procedure
The access URL of the AutoDST file can be specified using the configuration files.
Central Provisioning
(Configuration File)
204
<MAC>.cfg
Specify the access URL of the AutoDST
file.
Parameter:
auto_dst.url