In Internet of things (IoT) environments, many different identifiers from various resources could be created and used. It could be difficult to unite all the existing identifiers, but some systems could provide interoperability among heterogeneous identifiers. As an effective solution, an integrated resolution framework for a set of existing identifiers is provided. Therefore, Recommendation ITU-T X.675 analyses the requirements, such as identifier independence, identifier separation, compatibility, uniqueness, tolerance, stability, and security. The general architecture for the object identifier-based resolution framework is specified with several scenarios. The scenarios show how to operate the resolution framework for heterogeneous identifiers and locators. It should be noted that this is one means of achieving interoperability, and other methods of operation are possible with other identifiers and/or resolution systems.