What do you do to add more rings before the messaging starts ?
Depending on the kind the device you have (such as a HSPA/UMTS device) and the network you are on, you can dial *61*6473832355*11*. This should be immediately followed by the number of seconds you want the device to ring for. You then press the send button. There is more on this at http://support.bell.ca/Mobility/Rate_plans_features/How_to_set_the_number_of_rings_before_Message_Centre_picks_up.