108
Least Cost Routing
Description
Least Cost Routing (LCR) allows companies to route calls to alternate carriers to achieve the most
economical cost for a particular call.
Conditions
LCR may be invoked on a per station basis. A station can be denied direct access to trunks and be
forced to dial ‘9'. The digits dialed will be analyzed and a trunk group will be selected for the call. The
digits dialed may be modified by deleting leading digits and substituting others in their place. For
example 1-212-xxx-xxxx might be modified and 1-212-xxx-xxxx dialed in order to select a
specific LD service. In the case of a Foreign Exchange line the 1-212 could be deleted, the FX line
selected and the local call of XXX-XXXX be dialed to complete the call. The time of day and day of the
week can be considered in selecting the most economical route/carrier.
Programming
Mode 05-13-07 and 08 are used to mark days that carriers have special rates. The day of the week is
entered as 1 to 7 for Monday to Sunday.
Mode 75 is used to analyze the dialed digits and select a routing table for the call (Mode76).
Mode 76 provides 20 routing tables, each with 3 time periods. The routing tables can point the call to as
many as 4 trunk groups in order and cause modification of the digits dialed as necessary.
Mode 77 can provide up to 99 different modifications to be used by the Routing table.
Mode 78-STN-01 is used to set a routing level for a station.
0
= Disable LCR
1
= Use only the first trunk group in LCR
2
= Use first or second trunk group in LCR
3
= Use first, second or third trunk group in LCR
4
= Use all 4 available trunk groups in LCR
Note:
LCR will always use the highest priority (lowest numbered) trunk group when available.
Operation
Operation is automatic by dialing ‘9'. The call will not be out pulsed until enough digits have been dialed
to enable LCR to make a route and modification decision.
Example: Using an OCC by dialing 1010220
In this example the use of 1010220 is advised during daytime hours because the rate is better than using
the primary LD carrier. After hours the primary carrier has a rate which is better. In our example we will
say that we have only one TK GRP and all of our lines are local with a primary LD carrier of ATT
As a result of these factors we would like to route our calls to NY (212) area by 1010220 between 08:00
and 17:00 but use the primary carrier after 17:00 and before 08:00 in the morning.
The first thing we must do is to enter the digits we want LCR to act upon.
Mode 75 will require an entry of 1212dddddd 01.
This entry shows the dialed digits and the 01 to the right points to routing table 01.
So any call that begins with 1+212 will be subject to routing table 01.
Mode 76 is the routing table Mode. We can enter 3 time periods for each routing table.
Mode 76-01-A represents the first of 3 time periods for routing table 01.
Mode 76-01-B represents the second of 3 time periods for routing table 01.
Mode 76-01-C represents the third of 3 time periods for routing table 01.
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