Once a conference reservation is created the dial in number and passcode will never change. They are dedicated to you as long as your account stays active. If you created additional conference reservations for you account using the confernecing Hub you will be assigned a new dedicated dial in number and passcode combination. Although we cannot guarantee that you will get the same toll free dial in number everytime, we attempt to provision the same toll free dial in number for the same customers whenever we can for your convenience. So, you should receive the same dial in number for all your conference calls.