Your audio conferencing provider will configure dial-in conferencing phone numbers and passcodes for users based on a list ...

Your audio conferencing provider will configure dial-in conferencing phone numbers and passcodes for users based on a list that you provide to them. Use the Export Wizard to export the list of users that you want to allow to set up meetings with dial-in conferencing. Use the Import Wizard to import user dial-in conferencing settings from the file you receive from your audio conferencing provider.