When we were testing a connection on a GS3275 out to a monitor, we found one worked great (Viore). Phone still controlled/produced audio. Unfortunately, on a Dell monitor and a Viewsonic the HDMI sends the mic audio to the monitor, in effect, muting the near end. So, tried to find a way to have the HDMI only send video to the monitor and leave audio on the phone. Can't find a setting on the Grandstream phone or the TV to accomplish that feat. The picture on the Dell 21.5" HDMI monitor is fantastic, receiving sound great, but no mic.