Avaya BCM 4.0 Networking Guide de configuration télécharger pdf (Page 448)

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448 Chapter 52 Call security and remote access

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In addition to restricting telephone numbers, you can prevent people from entering dialing

sequences used by the central office (the public network) to deliver special services and features.

Some of these features provide the caller with dial tone after they have entered the special code

(which often uses # or *), therefore, users have an opportunity to bypass restrictions. To prevent

this from happening, you can create filters that block these special codes.

You create a filter by defining the dialing sequences that are denied. There are also variations of

each sequence that you want users to be able to dial, these are called overrides. Overrides are

defined within each restriction package for each filter.

Once you create the filters, you can assign the restrictions to a telephone, to a line, to a particular

line on a telephone, and to remote callers.

• Each programmable filter can have up to 48 restrictions.

• There is no limit on the number of overrides that can be allocated to a restriction. However,

there is a maximum total of 400 restrictions and overrides allocated to the 100 programmable

filters.

• The maximum length of a restriction is 15 digits.

• The maximum length of an override is 16 digits.

• Entering the letter A in a dialing sequence indicates a wild card, and represents any digit from

0 to 9.

• You can use * and # in a sequence of numbers in either a restriction or an override. These

characters are often used as part of feature codes for other systems or for features provided by

the central office (the public network).

• When restricting the dialing of a central office feature code, do not forget to create separate

restrictions for the codes used for DTMF and pulse lines (for example, *67 and 1167).

• Do not string together a central office feature code and a dialing sequence that you want to

restrict. Create a separate restriction for each.

• You can copy restrictions and overrides from one filter to another. You can use a restriction or

override in any number of filters. Each time you use a restriction or override, it counts as one

entry. For example, if restriction 411 exists in filters 01, 02 and 03, it uses up three entries of

the 400 entries available.

• Removing a restriction from a filter has no effect on the contents of other filters, even if the

restriction was copied to them.

• You cannot delete a filter. Removing the restrictions programmed on a filter makes it an

unrestricted filter but the filter itself is not removed.

Default filters (North America)

Filter 00 permits unrestricted dialing and cannot be changed.

Filter 01 is pre-programmed with 10 restrictions and some associated overrides. In Filter 01,

Restriction 02 and Override 001 allow long distance toll free calls.

Note: Filter 00 cannot be changed. Filter 01 has a set of defaults. Filters

02 to 99 can be set to suit your special requirements. See “Default filters

(North America)” on page 448.

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Avaya BCM 4.0 Networking Guide de configuration Page 448

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