We are having consistent problems with the audio dropping on our 8528 model phones when we use the speakerphone. Our vendor has told us that it is because the 8528 has a half-duplex microphone. Their solution is for us to swap out the digital phones for IP phones which have a full duplex microphone. I’m looking for a second opinion. Is that really the only solution? Has anyone aware of a digital phone with a full duplex mic or a flag setting that fixes this problem?