How the ETM® System Presents Non-North American Numbering Plan (NANP) Calling Sequences

Article #ETM406A

Each Span in the ETM® System uses a Dialing Plan to recognize, normalize, and
classify calling sequences for ETM Policy processing, display, reporting, and
service-type classification (such as long-distance, local, or international). Dialing
Plans are customized for the specific Appliance locale to ensure that the calling
sequences the Span receives are correctly processed for Policy processing and number
recognition. This required Dialing Plan configuration for essential ETM System
functions is performed during every ETM Appliance installation.

For countries that use the North American Numbering Plan (NANP), the basic
configuration to ensure proper policy processing also results in display and
reporting in the format customary to the locale, for example, 1(210)402-9669.

Numbering plans for customer facilities located outside of NANP, however, can differ
greatly and are more complex. For these sites and for international calls dialed from
NANP countries, the default Dialing Plan configuration included with a standard
installation does not result in display and reporting in the manner customary to the
locale. Rather, the phone number is presented as followscountry code, a set of empty
brackets, and then the remaining digits as one sequence. For example, a phone number
in France might appear in the ETM System as 33()144419900. Although visually
different, this format is the minimum required to enable calling sequences to be
properly matched for ETM Voice Firewall and IPS Policy processing and enforcement.

For those who are concerned with these issues, SecureLogix offers services to perform
more complex customization of the Dialing Plan to modify this formatting into the
desired presentation for most calling sequences (except in certain cases such as when
no NPA is used for certain types of calls). This customization is outside the scope
of a standard ETM System installation, however. Contact your SecureLogix Sales
Representative for information regarding available Dialing Plan customization services.

See the attached article for more information.

Published on August 14, 2014  |  Updated on January 18, 2022

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