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The G means that these phones have a 1000 Mbit Ethernet switch
Siemens/Unify Openstage 20 HFA/SIP Telephone
Siemens/Unify Openstage 20E HFA/SIP Telephone
As the OpenStage 20 but without full duplex handsfree talking
Openstage 80 HFA/SIP Telephone
When connected to ‘T’ phones a separate power supply is required.