An own DDI must be mapped to every script of the ixi-UMS Auto Attendant. Moreover, the ixi-UMS Auto Attendant needs an own sender/service-number.
All the numbers must be taken from the number pool of the used ISDN- / VoIP-connection. The numbers are entered in the ixi-UMS Kernel Configuration at DDI Mapping and thus CANNOT be used as fax- or voice mail-numbers!