Better Music Builder VM-82U G3 Instruction Manual download pdf (Page 246)

Voice messaging systems

7-44 Issue 9 May 2003

■ Do not create voice mailboxes before they are needed.

■ Avoid or closely monitor the use of “guest” mailboxes (mailboxes without a

physical extension that are loaned to outsiders for the duration of a

project). If you need a guest mailbox, assign it when it is needed and

deactivate or change its password immediately after it is no longer needed.

Do not reassign a guest mailbox without changing the password.

Restrict outcalling

Outcalling uses the voice messaging ports. If mailbox security is broken,

unauthorized persons can use outcalling to transfer messages at your expense. If

you need outcalling, restrict it as far as possible to eliminate the possibilities for

theft of services.

■ Do not enable outcalling at all if you do not need it. Do not enable outcalling

for any subscribers who do not need it.

■ If outcalling is used only to ring in-house telephones that do not have

message waiting lights, restrict the number of digits to the maximum length

of extension.

■ If possible, restrict outcalling to the local area (7 digits), or North American

(10 digits).

■ If outcalling must be done to pagers, use pagers that have individual DID

numbers so that pager identification digits are not required and restrict any

additional digits for call identification to the minimum possible.

■ If a limited number of pagers are in use, consider putting the pager

numbers on all unrestricted calling list so that outcalling can be effectively

limited to only those numbers.

Detecting toll fraud

With SMDR activated for incoming calls, you can check the calls into your voice

mail ports. A series of short holding times may indicate repeated attempts to enter

voice mailbox passwords.

Review SMDR reports for the following symptoms of voice messaging abuse:

■ Short holding times on calls where voice messaging is the originating

endpoint or terminating endpoint

■ Calls to international locations not normal for your business

■ Calls to suspicious destinations

■ Numerous calls to the same number

■ Undefined account codes

NOTE:

The MERLIN LEGEND system only records the last extension on the call.

Internal toll abusers transfer unauthorized calls to another extension before

they disconnect so that the SMDR does not track the originating station. If

the transfer is to your voice messaging system, it could give a false

indication that your voice messaging system is the source of the toll fraud.

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Better Music Builder VM-82U G3 Instruction Manual Page 246

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