What does PSTN mean?
PSTN refers to the Public Switched Telephone Network, the legacy
standard that made telephone service nearly universal over the
last hundred years. The PSTN is based on analog telephone sets
with copper wire circuits that are switched to connect phones
together. TDM trunk lines are also considered part of the PSTN.
How does a network firewall
The firewall set the rules about what types of traffic are allowed
and to which machines. It examines data packets and traffic patterns
to find and block attacks such as Denial of Service. The firewall
also keeps outsiders from trying to sneak in through unguarded
ports or from even knowing the internal architecture and devices
on the LAN.
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