Section: 19.2 Call flows in roaming scenarios
Content: The procedures described in clause 17 of the present specification: Session Start procedure (clause 17.5.2), Session Stop procedure (clause 17.5.3), Registration procedure (clause 17.5.4), De-registration procedure (GGSN initiated) (clause 17.5.5), De-registration procedure (BM-SC initiated) (clause 17.5.6), Trace Session Activation procedure (clause 17.5.8), Trace Session Deactivation procedure (clause 17.5.9), MBMS UE Context Modification procedure (clause 17.5.10), and Session Update procedure (clause 17.5.11) work exactly the same in roaming scenarios, i.e when the GGSN is in a visited PLMN and the BM-SC is in the home PLMN, and they are Gmb procedures only and are not needed over Mz interface. Service activation procedures and Service deactivation procedures are the only procedures over Mz interface, and are described in detail in the following subclauses.