if you have a say 6 persons conf. and enough resources to maintain two conferences, you could make a "BRA-BRA" digital connection, and have a 6 + 6 (minus one for bridging) = 11 person conference.
As same for 29 + 29 (minus one) = 57 people conference. For this you will also have enough resources like a GA with MADA3 in common hardware (plus GD with MADA3

