We have had issues with callers from outside our office not being able to clearly hear conversations (some have said that it sounds like we are in a tunnel or really far away). We had the Polycom troubleshooted, updates installed and factory settings reset by a phone tech, but are still not getting the best range of volume from the phone. We did get, strangely enough, better reception when an outside calller would use their cell phone versus a land line. We have read the manual front to back, but are at a loss for what the problem could be. Would great appreciate advise!