Yeah it's bloody frustrating.
In saying that, I have wired earbuds I can use - they're just not very convenient if I am on hours and hours of back to back VC's and want to pace the room...
For all my calls I use the mic in the camera and an external speaker. So I can walk around and still hear people and rush over if I want to talk. With up to 60 people on a call most of us are not sending video.


