Lucent Technologies 555-661-150 사용자 설명서

Issue 1

August 1998

Customer Support Information 

Page A-17

Other Security Hints 

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Be suspicious of any caller who claims to be with the telephone company 
and wants to check an outside line. Ask for a callback number, hang up and 
confirm the caller’s identity.

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Never distribute the office telephone directory to anyone outside the 
company; be careful when discarding it (shred the directory).

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Never accept collect telephone calls.

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Never discuss your telephone system’s numbering plan with anyone 
outside the company.

1

Operators or attendants need to be especially aware of how to recognize and 
react to potential hacker activity. To defend against toll fraud, operators should 
follow the guidelines below:

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Establish procedures to counter 

social engineering. Social engineering is a 

con game that hackers frequently use to obtain information that may help 
them gain access to your communications system or voice messaging 
system.

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When callers ask for assistance in placing outside or long-distance calls, 
ask for a callback extension.

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Verify the source. Ask callers claiming to be maintenance or service 
personnel for a callback number. Never transfer to 

*

10 without this 

verification. Never transfer to extension 900.

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Remove the headset and/or handset when the console is not in use.

1

To detect toll fraud, users and operators should look for the following:

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Lost voice mail messages, mailbox lockout, or altered greetings

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Inability to log into voice mail

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Inability to get an outside line

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Foreign language callers

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Frequent hang-ups

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Touch-tone sounds

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Caller or employee complaints that the lines are busy

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Increases in internal requests for assistance in making outbound calls 
(particularly international calls or requests for dial tone)

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Outsiders trying to obtain sensitive information

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Callers claiming to be the “phone” company

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Sudden increase in wrong numbers