BinTec X3200, Руководство пользователя

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Security Mechanisms
7
7.2.2 Checking the Calling Party Number
CLID X3200 uses Calling Line Identification (
➤➤
CLID ) to check the calling party
number of an incoming call.
Screening indicator You can also determine whether calling party numbers have been modified by
the calling parties. With some connections, it is possible that another number
(e.g. 5678 ) is displayed at the called party’s terminal, instead of the calling par-
ty’s own extension number (e.g. 1234 ). X3200 can detect this from the screen-
ing 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 ex-
change (normal case).
If you want X3200 to check the screen indicator for incoming calls, you must en-
ter one of the values stated in the following MIB tables or variables (only incom-
ing calls with the corresponding screening indicator are accepted):
➤
For incoming PPP connections: Screening variable in biboDialTable.
➤
For incoming ISDN Login connections: Screening variable in isdnloginAl-
lowTable.
You can create additional user accounts with the aid of SNMP commands (see
the Software Reference). A certain password and a certain action can be
assigned to a user.