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L-5
L-5
General Description
This feature allows the NEAX2400 ICS 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
To operate:
a.) Lift the handset; receive Dial Tone.
b.) Dial the trunk access code (usually "9"); receive second Dial Tone.
c.) Dial the area code, office code and number.
d.) The system automatically completes the call via the most economical route.
Service Conditions
Following, is a step-by-step explanation, which when reviewed in conjunction with Figure 1, will provide
a better insight as to how the NEAX2400 ICS 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 (See Note).
If the NXX is not located in either table, refer to Service Condition (3). There is a maximum of
256 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, 256 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 again 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.
Page 286
Least Cost Routing - 3/6-Digit
Least Cost Routing - 3/6-Digit
NEAX2400 ICS Business Features and Specifications
NDA-24143, Issue 4
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