Better Music Builder VM-82U G3 Instruction Manual download pdf (Page 160)

Small business communications systems

6-22 Issue 9 May 2003

■ 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 to disallow dialing 0, 11, 10, 1700, 1809, 1900, and 976 or

1 (wildcard) 976. Disallowed List number 7 does not include 800,

1800, 411, and 1411, but Avaya recommends that you add them.

Assign all voice mail port extensions to this Disallowed List. Avaya

recommends assigning Disallowed List number 7. This is an added

layer of security, in case outward restriction is inadvertently

removed. (Voice messaging ports are assigned, by default, to

Disallowed List number 7.)

If outcalling is required by voice messaging system extensions:

■ Program an ARS Facility Restriction Level (FRL) of 2 on voice mail

port extensions used for outcalling.

■ If 800 and 411 numbers are used, remove 1800, 800, 411, and 1411

from Disallowed List number 7.

■ If outcalling is allowed to long-distance numbers, build an Allowed

List for the voice mail port extensions used for outcalling. This list

should contain the area code and the first three digits of the local

exchange telephone numbers to be allowed.

Additional general security for voice messaging systems:

■ Use a secure password for the general mailboxes.

■ The default administration mailbox, 9997, must be reassigned to the

system manager’s mailbox/extension number and securely

password protected.

■ All voice messaging system users must use secure passwords

known only to the user.

Security risks associated with the Automated

Attendant feature of voice messaging systems

Two areas of toll fraud risk associated with the Automated Attendant feature of

voice messaging systems are:

■ Pooled facility (line/trunk) access codes are translated to a menu prompt to

allow remote access. If a hacker finds this prompt, the hacker has

immediate access. (Dial access to pools is initially factory-set to restrict all

extensions: to allow pool access, this restriction must be removed by the

system manager.)

■ If the automated attendant prompts callers to use Remote Call Forwarding

(RCF) to reach an outside telephone number, the system may be

susceptible to toll fraud. An example of this application is a menu or

submenu that says, “To reach our answering service, select prompt

number 5,” and transfers a caller to an external telephone number. Remote

call forwarding can be used securely only when the central office provides

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