I just had the same issue, the microphone Input Level was pinned to the maximum. I suspect it is because I plugged in the Mini and went right into a call without testing the devices audio settings first. Check in "Audio" (for what ever app your using...
Haydn,In order for three screen to work when connecting to the 8710 you must preserve SIP end to end. Based on what I have read it seems that your call is being interworked from SIP to H.323 by your VCS. Is your 8710 using a numeric SIP alias and do ...