4.1.7 Outbound traffic from foreign to own NE

29.2043GPPArchitecture, functional description and protocol detailsRelease 17Signalling System No. 7 (SS7) security gatewayTS

This scenario is shown in figure 4.1.7. The message is originated at a NE outside the PLMN. It may transit several transit nodes outside the PLMN, an SS7 Security Gateway of the PLMN in inbound direction (see Clause 4.1.2), and several transit nodes inside the PLMN before it reaches the SS7 Security Gateway in outbound direction. This SS7 Security Gateway protects the message according to the reverse relevant Security Association. The message may then transit several transit nodes outside the PLMN, another SS7 Security Gateway of the PLMN in inbound direction (see Clause 4.1.2) and several transit nodes within the PLMN before it reaches the destination NE inside the PLMN.

Figure 4.1.7: Outbound traffic from foreign to own NE