Jumping from one conference to another conference

Hi all,

I was just wandering if it was possible to change conference rooms by pressing a key on your telephone.

A user dials a number and gets connected to a system which asks them what conference room they want to join. (from 1-9) Lets say the user enters room 1. If the user now wants to exit this room and enter another conference room can they press * to return to the “lobby” area then choose rooms 2, 3, 4 e.tc.?

Is this possible for development, or has it already been developed?

If anyone can give suggestions or comments I will greatly appreciate it.