At the beginning of registration subscription, provision of the supplementary service and sufficiency of registration information has to be checked. The default priority level has to be registered in the network. When the mobile subscriber registers eMLPP, the network shall attempt to register the service. The network will return notification of acceptance of the request. This notification will include the default priority level. If the system cannot accept a registration request, the network sends a notification that eMLPP registration was not successful to the served mobile subscriber. The information flow for registration of eMLPP is shown in Figure 8.

The mobile subscriber can request the status of the supplementary service, the maximum and default priority levels and be informed if the service is provided to him/her and on the actual maximum and default priority levels. This procedure is illustrated in Figure 9.