UE_out  : (A,Z)
gNB_out : (gNB, B)(GTP: TEID T)(A,Z)       -> Interface N3 unmodified
                                              (IPv6/GTP)
SRGW_out: (SRGW, S1)(U2::T, C1; SL=2)(A,Z) -> B is an End.M.GTP6.D
                                              SID at the SRGW
S1_out  : (SRGW, C1)(U2::T, C1; SL=1)(A,Z)
C1_out  : (SRGW, U2::T)(A,Z)               -> End with PSP
UPF2_out: (A,Z)                            -> End.DT4 or End.DT6