Configuring Call Routing

Understanding the call-routing database

Table 19-1. Fields in a call-routing database entry (continued)

Field

Source

Type

Contains

The address of a device that receives calls The address has the same format as the Device field.

The call-routing type. For default entries (entries created by the system) the value depends on the type of installed device. For entries created by user-specified Call-Route profiles, see “Call-Route profile settings” on page 19-5.

TG

A trunk group number. The default is zero.

SA

An ISDN subaddress number. The default is zero.

Phone

A telephone number.

How call routes affect device usage

The system sorts its call-routing database entries after a reset. During active use, the system applies operational criteria, such as availability and frequency of use, to the order in which it uses devices.

By default, entries for modem devices are sorted to load-balance calls across the modem cards in a quadrant, and entries for HDLC channels are sorted to group the channels of a multilink call on a single card when possible. For both types of calls, cards in lower-numbered slots precede those in higher-numbered slots.

Entries for trunk lines are initially sorted in the order in which the lines are installed in the system, with lines in lower-numbered slots preceding those in higher-numbered slots.

Modem usage and database sort order

The default sort order for modems is determined by the following parameter, shown with its default settings:

[in SYSTEM]

call-routing-sort-method = item-first

In a device address, the item number represents a particular device on a slot card. An item number of 0 (zero) denotes the whole slot, and the numbering begins with the leftmost device on the card. The Item-First sort method means the system sorts the components of device addresses in the following order:

item:shelf:slot:logical:item

For example, if two modem cards are supported, one in shelf 1, slot 2 and the other in shelf 1, slot 4, the initial modem usage order looks like this:

1:1:2

1:1:4

2:1:2

2:1:4

3:1:2

APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide

19-3

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Lucent Technologies 7820-0802-003 manual How call routes affect device usage, Modem usage and database sort order, Field