I've deployed these successfully by programming them as Generic SIP Phone, and no need to setup SIP Capabilities. Everything can be done from the User and Services Configuration form on the MiVB. Super easy.
On the UC360 side, you need to open Advanced Settings, administrator password is 'admin' and then enter the SIP Settings. Essentially just the SIP Server (MiVB Address), Extension/Username/SIP Username are all whatever the extension is, and then the Password which you defined when you programmed the phone in MiVB.