Yealink SIP-T48G Administrator's Manual page 270

Microsoft Lync Edition Administrator's Guide for SIP-T2_Series and T4_Series IP Phones
Time Zone
GMT0
GMT0
GMT+1
GMT+1
GMT+1
GMT+1
GMT+1
GMT+1
GMT+1
GMT+1
GMT+1
GMT+1
GMT+1
GMT+1
GMT+1
GMT+1
GMT+1
GMT+1
GMT+1
GMT+2
GMT+2
GMT+2
GMT+2
GMT+2
GMT+2
GMT+2
GMT+2
GMT+2
GMT+2
GMT+2
GMT+2
GMT+2
GMT+2
GMT+3
GMT+3
GMT+3
GMT+3:30
GMT+4
GMT+4
GMT+4
GMT+4
GMT+4
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Time Zone Name
United Kingdom(London)
Morocco
Albania(Tirane)
Austria(Vienna)
Belgium(Brussels)
Caicos
Chad
Spain(Madrid)
Croatia(Zagreb)
Czech Republic(Prague)
Denmark(Kopenhagen)
France(Paris)
Germany(Berlin)
Hungary(Budapest)
Italy(Rome)
Luxembourg(Luxembourg)
Macedonia(Skopje)
Netherlands(Amsterdam)
Namibia(Windhoek)
Estonia(Tallinn)
Finland(Helsinki)
Gaza Strip(Gaza)
Greece(Athens)
Israel(Tel Aviv)
Jordan(Amman)
Latvia(Riga)
Lebanon(Beirut)
Moldova(Kishinev)
Russia(Kaliningrad)
Romania(Bucharest)
Syria(Damascus)
Turkey(Ankara)
Ukraine(Kyiv, Odessa)
East Africa Time
Iraq(Baghdad)
Russia(Moscow)
Iran(Teheran)
Armenia(Yerevan)
Azerbaijan(Baku)
Georgia(Tbilisi)
Kazakhstan(Aktau)
Russia(Samara)