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Chapter 5 – Callback Security
Multi-Tech Systems, Inc. MT5634IND User Guide (S000369A) 15
Chapter 5 – Callback Security
This chapter describes how to use callback security with your modem. Callback security protects your network from
unauthorized access and helps control long-distance costs. When callback security is enabled, all callers are
requested to enter a password. If a valid password is received, the modem hangs up and returns the call by dialing a
phone number that is stored with the password. The person being called back must then enter the password a
second time to establish a connection.
Up to 30 callback passwords and dialing strings can be stored in the modem. Each dialing string can be up to 34 or
35 characters long and can contain commands as well as phone numbers. For mobile callers, the dialing string can
be programmed to allow the caller to bypass the stored callback number by entering a temporary callback number, to
enter an extension at the callback number, or to make a direct connection without callback.
For local security, the passwords and dialing strings that are stored in the modem are protected from tampering by a
setup password, which you should change when you set up the modem. You can further protect the modem against
tampering by disabling its ability to respond to most AT commands. To check for attempted break-ins, you can
request the modem to display the number of failed password attempts.
Your modem was shipped with a default setup password (MTSMODEM). The same password is used for both
callback security and remote configuration. Because anyone who has access to this guide has access to the default
password, you should change the password during your initial setup.
Changing the Setup Password
1. Open a data communications program such as PhoneTools.
2. In the terminal window, type AT#SMTSMODEM (or AT#Sxxxxxxxx if you have replaced the MTSMODEM
password with xxxxxxxx). Press E
NTER. The modem responds with OK if the setup password is correct and
ERROR if it is wrong.
3. To change the password, type AT#S=xxxxxxxx, where xxxxxxxx stands for the password, and then press
Enter. The password can include any keyboard character, and can be up to eight characters long. The
modem responds with OK.
4. The new password is saved automatically. You can now either enter more AT commands or exit the data
communications program. The next time you wish to set up the modem, you must use the new password.
CAUTION: Passwords are case-sensitive. The next time you enter the password, it must be in the same
case as you set it up.
Turning Callback Security On and Off
Callback security must be turned on to enter many callback security commands.
1. Open a data communications program such as PhoneTools.
2. In the terminal window, type AT#Sxxxxxxxx, where xxxxxxxx is your password. Press Enter. The modem
responds with OK if the setup password is correct and ERROR if it is wrong.
3. Type one of the following commands:
To turn off callback security: Type AT#CBS0 and press Enter. Callers no longer need a password to
connect to the modem, the modem is unable to call them back, and the stored dialing command
locations 0–3 become available.
To turn on both local and remote callback security: Type AT#CBS1. Press Enter. With local
security turned on, you must enter the setup password before you can enter any AT command except
the AT, ATIn, and AT#Sxxxxxxxx commands.
To turn on remote callback security only: Type AT#CBS2 and press Enter. With remote callback
security turned on, each caller is asked to enter a password, is called back, and then is asked to enter
the password again before a connection can be made. Also, dialing command locations 0–3 for use with
the DS=y dialing command are replaced by callback dialing command locations 0–29.
To temporarily disable callback security if the modem is set to #CBS1 or #CBS2 (for instance, to
call another modem): Type AT#CBS3 and press Enter. The modem returns to its original setting
when you issue the hangup command (+++ATH) or the modem is reset. Note that if a remote modem
breaks the connection, callback security remains disabled.
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Table des matières

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1

ID: SEM-250-A1_11_V1.0

2

Prehad / Übersicht

3

Contents

4

Overview

4

1. Safety information

5

2. Items supplied

6

3. Fitting and removing

6

4. Operation

6

5. Cleaning

7

6. Disposal

7

7. Troubleshooting

8

8. Technical

8

9. Warranty

9

Przegld

10

1. Wskazówki

11

2. Zakres dostawy

12

3. Monta i demonta

12

4. Obsuga

13

5. Czyszczenie

13

6. Utylizacja

14

7. Rozwizywanie

14

8. Dane techniczne

15

9. Gwarancja

15

Áttekintés

16

1. Biztonsági utasítások

17

2. A csomag tartalma

18

3. A pengék fel- és

18

4. Kezelés

18

5. Tisztítás

19

6. Eltávolítás

19

7. Problémamegoldás

20

8. Mszaki adatok

20

9. Garancia

20

1. Varnostna navodila

23

2. Obseg dobave

24

3. Montaža in demontaža

24

4. Uporaba

24

5. išenje

25

6. Odstranjevanje med

25

7. Reševanje problemov

26

8. Tehnini podatki

26

9. Garancija

27

1. Bezpenostní pokyny

29

2. Rozsah dodávky

30

3. Montáž a demontáž

30

4. Ovládání

30

5. ištní

31

6. Likvidace

31

7. ešení problém

32

8. Technické parametry

32

9. Záruka

32

1. Bezpenostné pokyny

35

4. Obsluha

36

5. istenie

37

6. Likvidácia

37

7. Riešenia problémov

38

8. Technické údaje

38

Übersicht

40

1. Sicherheitshinweise

41

2. Lieferumfang

42

3. Montage und

42

Demontage der Klingen

42

4. Bedienung

42

5. Reinigen

43

6. Entsorgen

44

7. Problemlösungen

44

8. Technische Daten

45

9. Garantie

45

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