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NEAX2400 IPX Feature Programming Manual
NDA-24297, Issue 1
Page 425
Least Cost Routing - 3/6-Digit L-5
L-5 Least Cost Routing - 3/6-Digit
General Description
This feature allows the NEAX2400 IPX to be programmed to route outgoing calls over the most economical facility
(WATS, FX, DDD). Based on the area code and office code dialed (6-digit analyzing), the system examines the
programming tables and chooses the facilities in the order specified. Least-Cost Routing (LCR) may also be
performed on a sender basis (LCR(S)).
Operating Procedure
1. Lift the handset; receive dial tone.
2. Dial the trunk access code (usually “9”); receive second dial tone.
3. Dial the area code, office code and number.
4. The system automatically completes the call via the most economical route.
Service Conditions
The following is a step-by-step explanation, which when reviewed in conjunction with the figure on the following
page, will provide better insight as to how the NEAX2400 IPX switch accomplishes LCR:
1. If dialing a toll or local call (NPA-NXX-XXXX or NXX-XXXX), routing begins with translation of 3-
digit (NPA or NXX) area or office code. For specific numbers, this translation may result in the immediate
selection of the 3-digit routing patterns. If the number dialed is an NPA and 6-digit translation is required,
the NXX code is verified in the SCC (XX) or the FX (XX) Table
Note. If the NXX is not located in either
table, refer to Service Condition (3). There is a maximum of 4000 Outgoing Pattern Routing (OPR) Tables
with a maximum of 8 routes for selection.
Note: a. SCC (XX) is the Special Common Carrier NXX Translation Table.
b. FX (XX) is the FX NXX Translation Table.
2. First-choice route option in an NPA pattern will usually be a Specialized Common Carrier. If a trunk is
available in this group, further digit translation will be required in order to determine whether the called
number is served by the carrier. NXX digit translation will also be required in instances where a call is
routed over a TIE or FX trunk. For these purposes, 4000 NXX patterns are available.
3. In the case of Specialized Common Carriers, associated NXX patterns will return either a YES or a NO
answer to the switch, indicating whether or not the dialed number is within the designated service area of
the selected SCC. If service is available, the switch will seize the trunk and complete the connection. If
the NO answer is returned, the switch searches for the next available trunk group.
4. Calls routed over FX trunk groups may require out-pulsing of prefix digit “1”, depending on the NXX
number dialed. For this purpose, another group of associated NXX patterns may be used, operating on the
same YES/NO principle. A YES answer returned to the switch in this instance will result in prefix “1”
being added automatically before sending digits to the called Central Office.
5. Where the selected route is an FX trunk group, NXX translation may be used to either allow or disallow
the connection. This is accomplished via YES/NO answers from a designated group of NXX patterns, and
enables calls to selected Central Office areas to be effectively restricted to only the most economical
routes.
The routing method described provides some of the most flexible options available for call routing, and
functions as a highly effective method of cost control. For details, see the following figure.