Each dial plan created can be associated with a dial-in conferencing region, which is how a dial-in conferencing access number determines what normalization rules to apply. Despite the same terminology, regions are not actually tied to the network region definitions used for the Call Admission Control and Media Bypass features. Dial-in conferencing regions can be defined and created only through a dial plan object.
There is no specific configuration required for dial-in conferencing regions; however, at least one must be specified on a dial plan to use the dial-in conferencing features.