Section: 17.1 MBMS user authorisation
Content: Upon reception of an IGMP (IPv4) or MLD (IPv6) Join message for an IP multicast address allocated to MBMS services, the GGSN shall request authorisation of the user for this multicast MBMS bearer service (identified by the PDP context over which the IGMP join is received). The GGSN shall support pre-configuration of a BM-SC or Gmb proxy server for authorisation purposes to which the request shall be sent. The GGSN may support a list of pre-configured BM-SC servers based on the MBMS bearer service requested, for authorisation purposes. Upon receipt of an MBMS UE Context Establishment Request for a user who has not already been authorised for the MBMS bearer service, the GGSN shall request authorisation of the user for this service.