The Registered SIP Bindings for User object is a child of the Registered SIP Bindings object.
The Registered SIP Bindings for User object does not have any modifiable fields or pushbuttons, and you cannot configure or manage it. It exists simply as a way of grouping the Registered SIP Binding objects for a particular user (Individual Line or Business Group Line). Each Registered SIP Binding corresponds to a SIP device that has registered with the NE for this user; the user's configuration specifies the maximum number of registrations that each user can make.
In the EMS System Explorer, the name shown for each Registered SIP Bindings for User object is the user's address, in the format 'username@domainname'.