BinTec X4000, Руководство пользователя

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X4000 User’s Guide 327
Access Security
10
screening indicator in the setup message of the ISDN
➤➤
D-channel . The
screening indicator has four possible values:
■
user: The calling party number indicated originates from the far end and has
not been checked by the network.
■
user_verified: The calling party number has been checked by the exchange
and is correct.
■
user_failed: The calling party number has been checked by the exchange
and is incorrect.
■
network: The calling party number indicated originates directly from the
exchange (normal case).
If you want X4000 to check the screen indicator for incoming calls, you must
enter one of the values stated in the following MIB tables or variables (only
incoming calls with the corresponding screening indicator are accepted):
➤
For incoming PPP connections: Screening variable in biboDialTable.
➤
For incoming ISDN Login connections: Screening variable in
isdnloginAllowTable.
10.2.3 Authentication of PPP Connections with PAP,
CHAP or MS-CHAP
➤➤
PAP ,
➤➤
CHAP and MS-CHAP are the common procedures used for
authentication of
➤➤
PPP connections. These use a standard procedure to
exchange a user ID and a password for checking the identity of the far end. You
can find further information in chapter 7.3, page 159 and chapter 8.1.3,
page 194 .
10.2.4 Callback
Callback The callback mechanism can be used for each WAN partner to obtain additional
security regarding the connection partner or to clearly allocate the costs of
connections. A connection is then not set up until the calling party has been