Specifications

Services
Destination Restriction/Least Cost Routing
9-6 Strata CIX Programming 05/08
Destination Restriction/Least Cost Routing
The Guide Pages and programs that follow control Strata CIX’s Destination Restriction (DR) and Least
Cost Routing (LCR) capabilities.
Programming DR/LCR features in Strata CIX requires an advanced knowledge of telephone programming.
Make sure you have a thorough understanding of the discussion that follows before attempting to program
these features. For details on LCR, see “LCR Overview” on page 9-12.
DR Overview
Strata CIX 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:
• 1 – long distance
• 0 – operator assistance
• 011 – international
Strata CIX has expanded this to include restriction based on any string of dialed digits. Strata CIX can
restrict any string of up to 13 dialed digits including
* and #.
Thirteen-digit screening allows control of access to individual telephone numbers in remote Area Codes.
Restriction of
* and # controls user’s 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 CIX may be connected.
Each OLG can be programmed to require or not require DR in “306 Outgoing Line Groups” on page 6-5. If
a trunk group requires DR, a table must then be established using “531 DR Screening Table for OLG” on
page 9-24.
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 1-800. Its exception table could
permit access to specific office codes within that area such as 1-800-234.