There are several ways to "mount" an O-RAN Managed Function (also called O-RAN component) to an ONAP based SMO for O1 interfacing. The term "mount" means to configure the SMO and/or NetConf-Server of the O-RAN Managed Function to establish a NetConf Session.
According to O-RAN OAM Interface specification the pnfRegistration VES message is used. The VES message informs the SMO about a new aor again functional Physical Network Function (PNF, Device, ...). The concept could also used for Virtual NetWork Functions (VNF).
For test purposes the pnfRegistration message content can be also send directly to the SMO Message Router (ONAP DMaaP) or in case of an OpenDaylight based O1-Controller a RestConf message can be send.