The use of FAIR Digital Objects to implement the FAIR principles and to make data practices more efficient is now widely accepted. It is also widely agreed that repositories are the care takers of FAIR Digital Objects, i.e., they need to store, manage and curate DO's bit sequences, maintain globally resolvable PIDs for the DOs and manage metadata of different kinds describing the DO’s bit sequence. The DO Interface Protocol is the unified protocol that allows to create and access FAIR DOs independent of how a repository is organising and modelling its data. Thus, repositories should talk DOIP, but the reality is different. The detailed discussion about the adaptation of these examples will help to estimate the efforts and costs for related other cases. At the RDA plenary in Helsinki we intend to discuss other cases in detail.