Yealink SIP-T2 SERIES Administrator's Manual page 960

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Time Zone
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Yealink IP phones trust the following CAs by default:
DigiCert High Assurance EV Root CA
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Deutsche Telekom AG Root CA-2
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Equifax Secure Certificate Authority
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Equifax Secure eBusiness CA-1
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Equifax Secure Global eBusiness CA-1
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GeoTrust Global CA
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GeoTrust Global CA2
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GeoTrust Primary CA
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GeoTrust Primary CA G2 ECC
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GeoTrust Universal CA
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GeoTrust Universal CA2
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Thawte Personal Freemail CA
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Thawte Premium Server CA
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938
Afghanistan(Kabul)
Kazakhstan(Aqtobe), Kyrgyzstan(Bishkek),
Pakistan(Islamabad), Russia(Chelyabinsk)
India(Calcutta)
Nepal(Katmandu)
Kazakhstan(Astana, Almaty), Russia(Novosibirsk,Omsk)
Myanmar(Naypyitaw)
Russia(Krasnoyarsk), Thailand(Bangkok)
Australia(Perth), China(Beijing), Russia(Irkutsk, Ulan-Ude),
Singapore(Singapore)
Eucla
Japan(Tokyo), Korea(Seoul), Russia(Yakutsk,Chita)
Australia(Adelaide), Australia(Darwin)
Australia(Brisbane), Australia(Hobart),
Australia(Sydney,Melboume,Canberra), Russia(Vladivostok)
Australia(Lord Howe Islands)
New Caledonia(Noumea), Russia(Srednekolymsk Time)
Norfolk Island
New Zealand(Wellington,Auckland), Russia(Kamchatka Time)
New Zealand(Chatham Islands)
Tonga(Nukualofa)
Chatham Islands
Kiribati
Time Zone Name