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The underlying infrastructure
for telecommunication allows
the Caller ID number to be
any phone number. For most
consumer-grade phones, the
provider does give the user
the ability to change this
number. However, for
commercial grade phone
system, this feature is used
to display a common phone
number on all outgoing
calls, such as in a call
center.
Attackers use this ability to
modify the caller ID to
trick the end user to either
taking a call or attempting
to add validity to the call.
If
the caller is requesting
non-public information or
for you to perform a
high-risk transaction, do
not provide information or
perform the action until the
request is verified as
authentic and authorized.
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