https://download.discomp.cz/Grandstream/Datasheets/Datasheet_gxp1630_english.pdf
Datasheethttps://download.discomp.cz/Grandstream/QIG/GXP1630_QIG-1.pdf
Quick Installation Guidehttps://download.discomp.cz/Grandstream/User%20Guide/GXP16xx-Series-Administration-Guide-Documentation-Center.pdf
Administration Guidehttps://download.discomp.cz/Grandstream/User%20Guide/GXP16xx-Series-User-Guide-Documentation-Center.pdf
User Guide