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In general, one may choose to expand a COI matrix in any of several different possible ways, 
depending upon the needs of the problem. In the preceding example, separating the endpoints 
into IP, circuit-switched, and PSTN makes sense for the upcoming resource-sizing calculations, 
as will be seen later in this document. In other examples, other sets of categories may be more 
appropriate. Also, the number of categories per site is not limited to three.

The discussion of COIs up to this point has been limited to stand-alone Communication 
Manager systems. It is also possible to network several Communication Manager systems 
together. IP tie trunks serve as the most common mode of interconnectivity. However, 
circuit-switched tie trunks are also supported.
To engineer a network of multiple Communication Manager systems, one must to know the 
topology of sites within each of the individual systems, and the overall topology of the entire 
configuration. Consider the network of systems that 

on page 197 shows.

 shows three distinct Communication Manager systems, that are interconnected by IP 

trunk groups. This network has a total of seven sites, which are labeled “S1” through “S7” in the 
figure. Systems 1 and 2 each have two sites, and System 3 has three sites.