Yealink SIP-T2xP Administrator's Manual page 284

Administrator's Guide for SIP-T2xP and SIP-T19P 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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Time Zone Name
Afghanistan
Kazakhstan(Aqtobe)
Kyrgyzstan(Bishkek)
Pakistan(Islamabad)
Russia(Chelyabinsk)
India(Calcutta)
Kazakhstan(Astana, Almaty)
Russia(Novosibirsk, Omsk)
Russia(Krasnoyarsk)
Thailand(Bangkok)
China(Beijing)
Singapore(Singapore)
Australia(Perth)
Korea(Seoul)
Japan(Tokyo)
Australia(Adelaide)
Australia(Darwin)
Australia(Sydney, Melbourne, Canberra)
Australia(Brisbane)
Australia(Hobart)
Russia(Vladivostok)
Australia(Lord Howe Islands)
New Caledonia(Noumea)
New Zealand(Wellington, Auckland)
New Zealand(Chatham Islands)
Tonga(Nukualofa)