This specification focuses on the following interface: ?C WAN-IF The interface between application hosting devices (AHD) and the wide area network (WAN). This interface is defined in the Continua architecture as described in clause 6 of [ITU-T H.810] There are a number of certified device classes (CDCs) related to the WAN-IF. This Recommendation contains interoperability design guidelines that are applicable to several CDCs. Security interoperability design guidelines is one such example. In addition@ this document also contains the design guidelines for the Consent enabled AHD and WAN CDCs. These CDCs may be grouped with multiple other WAN-IF related CDCs@ for example@ WAN observation upload or Questionnaire enabled CDCs.