https://download.discomp.cz/Grandstream/Datasheets/Datasheet_GWN7661E_English.pdf
Datasheethttps://download.discomp.cz/Grandstream/QIG/GWN7661E-QIG-ML.pdf
Quick Installation Guidehttps://download.discomp.cz/Grandstream/User%20Guide/GWN76xx-User_Manual.pdf
User Manualhttps://download.discomp.cz/Grandstream/User%20Guide/GWN76xx_Standalone_Guide.pdf
Standalone Guide