Which one of the following could a company implement to help reduce PBX fraud?

A.
Call vectoring

B.
Direct Inward System Access (DISA)

C.
Teleconferencing bridges

D.
Remote maintenance ports

Explanation:
The potential for fraud to occur in voice telecommunications equipment is a serious threat. PBX’s
(Private Branch Exchange) are telephone switches used within state agencies to allow employees to
make out-going and receive in- coming phone calls. These PBX’s can also provide connections for
communications between personal computers and local and wide area networks. Security measures
must be taken to avoid the possibility of theft of either phone service or information through the
telephone systems. Direct Inward System Access (DISA) is the ability to call into a PBX, either on an
800 number or a local dial-in, and by using an authorization code, gain access to the long distance
lines and place long distance calls through the PBX http://www.all.net/books/Texas/chap10.html