There are many API/Object Interface-related activities outside of ITU-T SG11. Many API/Object Interface specifications have already been released from such activities and a lot of discussions for new APIs/Object Interfaces are starting within them. However,there is no good reference material to help introduce the API/Object Interface specifications under current discussion and it is difficult to know what kind of APIs are released or discussed. This Supplement provides high-level descriptions of API/Object Interface-related activities outside of ITU-T,covering the interface between network control and application layers.This Supplement should be used as a reference to the other API/Object Interface activities outside of ITU-T.This Supplement will also help to avoid the overlapping of the standardization effort.