Lucent Technologies 6000 User Manual

MAX 6000/3000 Network Configuration Guide

 4-61

In Figure 4-7, suppose an MP+ call is connected to MAX #1. When that call needs to add a 
channel, it requests an add-on number from the MAX unit, and the unit returns 12 (for 
555-1212) as long as a channel in the local T1 lines is available. That is, the bundle does not 
span multiple MAX units as long as a channel is available in the local hunt group. 

The Figure 4-7 configuration tends to break down if MAX units receive MP-without-BACP 
calls. Spreading the calls across the MAX stack (by dialing the global hunt group) results in the 
worst possible performance, because MP without BACP must know all of the telephone 
numbers before the caller places the first call. 

Figure 4-8 shows a site that supports only MP-without-BACP calls. For this site, the telephone 
company has set up a global hunt group that first completely fills MAX #1, then continues to 
MAX #2, and so on. This arrangement tends to keep the channels of a call from being split 
across multiple MAX units, keeping overhead low. 

For a MAX unit that receives MP+ calls and MP calls with or without BACP, you can use a 
configuration similar to the one shown in Figure 4-8. In this case, however, you set up the 
global hunt group differently than explained in “MP+ and MP-with-BACP calls.”  You set up 
the global hunt group to help prevent MP-without-BACP calls from being split across multiple