G cluster1 osmo-epdg (combined ePDG/AAA) cluster2 epc eUE eUE strongswan strongswan eUE->strongswan SWu (ePDG) ims ims eUE->ims IPv4/IPv6 (tunnel) osmoepdg osmo-epdg/erlang strongswan->osmoepdg CEIA/GSUP HSS HSS osmoepdg->HSS SWx (AAA) PGW PGW osmoepdg->PGW S2b (ePDG) PGW->osmoepdg S6b (AAA) PGW->ims IPv4/IPv6 PCRF PCRF PCRF->PGW