The Network Appearance is a local reference shared by
SG and AS that together with a point code uniquely
identifies an SS7 node by indicating the specific SS7
network it belongs to. It can be used to distinguish
between signaling traffic associated with different
networks being sent between the SG and the ASP over
a common SCTP association. An example scenario is
where an SG appears as an element in multiple
separate national SS7 networks and the same point
code value may be reused in different networks.