Yealink Yealink SIP-T28P, Administrator'S Manual

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Administrator’s Guide for SIP-T2xP and SIP-T19P IP Phones
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Time Zone Time Zone Name
+04:30 Afghanistan
+05:00 Kazakhstan(Aqtobe)
+05:00 Kyrgyzstan(Bishkek)
+05:00 Pakistan(Islamabad)
+05:00 Russia(Chelyabinsk)
+05:30 India(Calcutta)
+06:00 Kazakhstan(Astana, Almaty)
+06:00 Russia(Novosibirsk, Omsk)
+07:00 Russia(Krasnoyarsk)
+07:00 Thailand(Bangkok)
+08:00 China(Beijing)
+08:00 Singapore(Singapore)
+08:00 Australia(Perth)
+09:00 Korea(Seoul)
+09:00 Japan(Tokyo)
+09:30 Australia(Adelaide)
+09:30 Australia(Darwin)
+10:00 Australia(Sydney, Melbourne, Canberra)
+10:00 Australia(Brisbane)
+10:00 Australia(Hobart)
+10:00 Russia(Vladivostok)
+10:30 Australia(Lord Howe Islands)
+11:00 New Caledonia(Noumea)
+12:00 New Zealand(Wellington, Auckland)
+12:45 New Zealand(Chatham Islands)
+13:00 Tonga(Nukualofa)
Yealink IP phones trust the following CAs by default:

DigiCert High Assurance EV Root CA

Deutsche Telekom AG Root CA-2

Equifax Secure Certificate Authority

Equifax Secure eBusiness CA-1

Equifax Secure Global eBusiness CA-1

GeoTrust Global CA

GeoTrust Global CA2

GeoTrust Primary CA

GeoTrust Primary CA G2 ECC