Services
Least Cost Routing/Destination Restriction
Strata CTX Programming - Part 2: CTX WinAdmin Programming 04/03 9-15
Services
DR Overview
Strata CTX offers DR as a major expansion of traditional Toll Restriction. Toll Restriction was used to
prevent the unauthorized use of toll prefixes to the PSTN as follows:
• – long distance
• – operator assistance
• – international
Strata CTX has expanded this to include restriction based on any string of dialed digits. Strata CTX can
restrict any string of up to 11 dialed digits including
and .
Eleven-digit screening allows control of access to individual telephone numbers in remote Area Codes.
Restriction of
and controls users' access to vertical service codes from the central office such as Camp
On and Call Forwarding.
DR is always applied to calls originated through LCR and may be applied to calls originated through Trunk
Group Access, Individual Trunk Access, CO Key, Group CO Key, Pooled Line Key, and Strata Net private
networking. Special screening tables allow restriction of calls placed through Centrex or PBXs to which
the Strata CTX may be connected.
Each OLG can be programmed to require or not require DR in “306 Outgoing Line Groups” on page 6-4. If
a trunk group requires DR, a table must then be established using “531 DR Screening Table for OLG” on
page 9-20.
DR is controlled by a DR Level (DRL) that is assigned to any station or trunk capable of making an outside
call. Each of the 16 DRLs relate to a DR Table. A DR Table may be an Allow or Deny table and may be
associated with an Exception Table. A Deny Toll Restriction Table contains a list of dial strings that are
prohibited. Its associated Exception Table lists the dial strings within the Deny Table ranges that would be
allowed. For example, a Deny table might deny access to all of Area Code
-. Its exception table could
permit access to specific office codes within that area such as
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