Instruction manual

Security goals tables
Issue 9 May 2003
4-17
Prevent exit from
voice messaging
system
Limit calling
permissions
Switch dial
restrictions
(System 25,
MERLIN II, and
MERLIN
LEGEND
communications
systems only)
Set outward/toll
restrictions
Set allowed/
disallowed lists
FRLs (System 25
and MERLIN
LEGEND
communications
systems only)
Set lowest
possible value
Restrict transfer
to registered
subscribers only
Transfer
restrictions
(MERLIN MAIL
R3 Voice
Messaging
System only)
Choose the
Transfer to
Subscribers Only
option
Prevent
unauthorized use
of facilities
Limit access to
ARS route
patterns
FRLs Set lowest
possible value
Restrict who can
use outcalling
COS
(MERLIN MAIL,
MERLIN
MAIL-ML, and
MERLIN MAIL
R3 voice
messaging
systems only)
Select a COS
that does not
permit outcalling
Table 4-2. Security goals: MERLIN II, MERLIN LEGEND, MERLIN Plus, and
System 25 communications systems — Continued
Security Goal Method Security Tool Steps
Continued on next page