1.2. SS7 Protocol Stack

The hardware and software functions of the SS7 protocol are divided into functional abstractions called levels. These levels map loosely to the Open Systems Interconnect (OSI) 7-layer reference model defined by the International Standards Organization (ISO). This model describes the structure for modeling the interconnection and exchange of information between users in a communications system.

Figure 2 shows the layers of the SS7 protocol stack when transporting SS7 signaling over the PSTN and how the layers relate to the layers of the OSI Model.

Figure 2. SS7 Protocol Stack Layers

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