You are right, i forgot that. The system is managed from the WBEM agent, traps are send with WBEM events . If the subscriptions are configured from SIM to send events to the SIM server all should be fine. Datacollection jobs collect info about the server for reporting purposes using WBEM.
You can select your servers in SIM selct Configure and select Manage Communication. Now SIM checks if it's able to receive events for the selected servers.