5.28.5.2. Network with Several Areas 
The network consists of three areas with area codes 69, 89, 79. Each
area contains three physical nodes which all support route optimization.
Within an area, routes must be configured between all nodes (see Section 48.5,
"Generation (Example)").
Routes must also be configured from all nodes in an area to all remote
areas and the parameter ROUTOPT=Y must be set so that the Route Optimization
feature works everywhere. It is not necessary to assign routes to the
individual nodes in a remote area.
Example:
- From physical node 2-89-200 to physical node 2-69-100:
ADD-RICHT:MODE=LRTENEW,LRTE=969,NAME="AREA 69",TGRP=100, DNNO=1-69-100,ROUTOPT=YES,INFO="TO AREA 69 with ROPT", PDNNO=2-69-100;
Define an outdial rule with the AMO LODR:ADD-LODR:ODR=100,CMD=ECHO,FIELD=2; ADD-LODR:ODR=100,CMD=END; ADD-LODR:ODR=100,INFO="AREA NUMBERING ROPT";
Define a routing element with the AMO LDAT:ADD-LDAT:LROUTE=969,LVAL=1,TGRP=100,ODR=100,LAUTH=1;
Add a digit pattern with the AMO LDPLN:ADD-LDPLN:LDP=69-X,LROUTE=969,LAUTH=1;
The route optimization request message on the standard route is modified by the node of subscriber A by means of the node connecting matrix. In compliance with KNMAT (see Chapter 41, "Number Modification"), the code for the home AREA (here 89) is added so that the node code for route optimization is now 89828901.In the node of user C the connection setup request for the alternative route is sent to call number 89828901. A route code is only assigned for area 89; no route code 828901 is configured. If the message is received in the entry node in area 89 (in this case node with node code 828902), node code 828901 is known there. The home area code 89 is removed (in LCR using an outdial rule, not provided) and the route to 828901 is seized.Figure 64. Network with several areas
