Conference Room Cam recommendation with good echo reduction?

GTO-HK

we are using logitech BCC950 at big conference room (can seat 20 ppls) but complained too much echo, if we move this one to a small conference room there is no echo

we prepare to buy a new cam with echo reduction, but dont know which one is good for big conference room, any recommendation?

KinChungE

咁大既房, 一定要用好多mic果種(e.g. Logitech Rally/Group再加N個MicPod)

唔好諗有任何cam內置mic可以收音收得好