A.MS---SGSN
B.SGSN---GGSN
C.SGSN---HLR
D.GGSN---DNS

A.MS---SGSN
B.SGSN---HLR
C.SGSN---GGSN
D.SGSN---MSC

A.Cell update
B.RA update
C.Combined RA/LA update
D.Cancel Lacation

A.Gr
B.Gs
C.Gb
D.Gi

A.PDP Context Deactivation
B.Detach
C.Cell update
D.RA update

A.Standby
B.Ready
C.Active
D.Idle

A.SGSN
B.HLR
C.GGSN
D.DNS

A.Active
B.Standby
C.Ready
D.Idle

A.MAP
B.TCAP
C.SCCP
D.MTP2

A.Gr
B.Gd
C.Gf
D.Gs

A.MS---BSS
B.BSS---SGSN
C.SGSN---GGSN
D.SGSN---HLR