When you back up the Utility Server data, phone model to group ID mapping is not backed up. Phone model to group ID mapping is maintained in the database. Therefore, to back up and restore this mapping, you must back up the Cassandra database as part of the Avaya Aura® Device Services backup procedure.

If the Avaya Aura® Device Services backup does not include the database backup, but the Utility Server was backed up and restored, then the restored system will not have phone model to group ID mapping. 46xxsettings.txt files will still be stored in group ID folders, but these folders will not be mapped to the correct phone models. In this case, you must manually assign group IDs to the phone models as described in Assigning a group identifier to a phone model. Otherwise, phones cannot download 46xxsettings.txt files from the Utility Server.