AT&T MERLIN LEGEND Communications System Key System Planning Forms Errata Instruction Manual download pdf (Page 275)

MERLIN LEGEND Communications System Release 5.0

System Planning

555-650-112

Issue 1

June 1997

Customer Support Information

Page A-13Toll Fraud Prevention

Preventive Measures 1

Take the following preventive measures to limit the risk of unauthorized transfers

by hackers:

■ Outward restrict all MERLIN LEGEND Communications System voice mail

port extension numbers. This denies access to facilities (lines/trunks). In

Release 3.1 and later systems, voice mail ports are by default outward

restricted.

■ As an additional security step, network dialing for all extensions, including

voice mail port extensions, should be processed through ARS using dial

access code

SECURITYlALERT:

The MERLIN LEGEND Communications System ships with ARS

activated with all extensions set to Facility Restriction Level 3,

allowing all international calling. To prevent toll fraud, ARS Facility

Restriction Levels (FRLs) should be established using:

■ FRL 0 for restriction to internal dialing only

■ FRL 2 for restriction to local network calling only

■ FRL 3 for restriction to domestic ong-distance (excluding

area code 809 for the Dominican Republic as this is part of

the North American Numbering Plan, unless 809 is required)

■ RL 4 for international calling

In Release 3.1 and later systems, default local and default toll tables

are factory-assigned an FRL of 2. This simplifies the task of

restricting extensions: the FRL for an extension merely needs to be

changed from the default of 3.

Each extension should be assigned the appropriate FRL to match its

calling requirements. All voice mail port extensions not used for

Outcalling should be assigned to FRL 0 (the default setting in

Release 3.1 and later).

■ Deny access to pooled facility codes by removing pool dial-out codes 70,

890-899, or any others on your system.

■ Create a Disallowed List or use the pre-prepared Disallowed List number 7

(Release 3.1 and later systems only) to disallow dialing 0, 11, 10, 1700,

1809, 1900, and 976 or 1(wildcard)976. In Release 3.1 and later systems,

Disallowed List number 7 does not include 800 and 1800 and 411 and

1411, but Lucent Technologies recommends that you add them. Assign all

voice mail port extensions to this Disallowed List. Lucent

Technologies recommends assigning Disallowed List number 7.

This

is an added layer of security, in case outward restriction is

inadvertently removed.

(In Release 3.1 and later systems, voice

messaging ports are assigned by default to Disallowed List number 7.)

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