When I run the respective upgrade utilities and click 'customise' I get a list of software that can be upgraded on the units but not all of the available components are ticked. For example the 3521 BRI gateway allows me to upgrade the 'Gateway Application', 'Gateway Wakeup', 'Gateway WEB interface', 'Gateway IVR recordings' and 'ISDN BRI Driver'. All of them are ticked by default except for the last one the ISDN BRI driver. Similar thing applies to the 350 MCU but in that case 3 things are unticked. I cannot find any documentation or help files on what all these components are and which to install and I am wondering whether I should tick everything or go with the defaults only. Does anyone know what is the best course of action or what ones you have chosen? I'm going to go with the default settings if no-one knows.