Avaya Configuring Dial Services (308621-14.20 Rev 00) Bedienungsanleitung PDF herunterladen (Seite 142)

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Configuring Dial Services

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308621-14.20 Rev 00

Example of a Security Breach

One carrier was using call screening as a first-level security barrier to ensure that

only calls from known branch offices were accepted. An intruder who knew an

allowed number specified a “user-provided” number in the local DTE. The DTE

inserted this number into the ISDN call setup packet, and potentially allowed the

intruder access.

To ensure security, the carrier can configure the router to select the

network-provided number and pass this number to the call screening function.

Although the network appends a network-provided number to the packet, the

user-provided number is found first and used for screening if not specified

otherwise.

If you have experienced attempts to circumvent your standard calling line ID

based security through user-based or calling device-based IEs, use the

network-provided screening bit option. If your network does not provide a calling

number information element, choose any option except network-provided to

ensure that calls get through.

Calls that do not contain the specified screening bit type are treated as if the

calling number is not present. If the appropriate calling number screening table

has been configured, the call is rejected. To enable calling line ID, see “Enabling

Calling Line ID Screening” on page 11-17.

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