Lcr; Chapter 32 Lcr; Overview - ZyXEL Communications ISG50-ISDN User Manual

Integrated service gateway

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This chapter shows you how to configure dialing rules, also referred to as LCR (Least Cost Routing)

on the ISG50.

The following figure shows an example of two LCRs. LCR1 is composed of outbound line groups

PSTN and ISDN along with the dial condition 01. (the period (.) is part of the dial condition). LCR2

is composed of outbound line group ITSP along with the dial condition 02.. When a user calls

"021234" the call is routed through the outbound line group defined in LCR2.

Figure 341 LCR Components Example

LCR1

Dial Condition

Dial Condition

When an LCR contains more than one outbound line group, as in the LCR1 example, the

administrator can prioritize the outbound line groups in the LCR. When a call is made using an LCR

with multiple outbound line groups, the ISG50 tries to use the higher priority outbound line group

first and, if the line is not available, then it tries a lower priority outbound line group.

The following figure shows a possible assignment of LCRs to authority groups. In our example, the

Sales authority group has been associated with both LCR1 and LCR2, so extensions that are part

of Sales can use any outbound line group they choose. The second authority group - Research,

ISG50 User's Guide