Broadly speaking, it consisted of a non-technical stage and a technical stage, all conducted via phone.
Non-technical stage included a chat with the equivalent of HR, finding out more about you and vice versa.
Technical stage was with a member of the team I would be joining, which was to find out more about my technical background. This included technical questions relevant to the work I'd be doing, in my case describing the inner workings of a particular process in detail.