278 CHAPTER 10: CONFIGURING ROUTING AND TRANSLATION SERVICES
servers R2a and R3a, you would set up a route that includes end point
R1a defined as type Redirect Call Processor.
This option reduces the number of routes you have to configure. If
you have a large installation, you could pick one region and have all
other servers have one redirect route to that region. Then you would
add all of the direct routes to all of the other sites on just that region
(R1a, in this example).
For very large installations (multiple regions with many branches),
each region could handle the direct routes to branches in that region
and have redirect routes for certain patterns to other regions.
Consequently, one region would not have to resolve every route.
Note that, if a call can terminate at a region (because there are users
configured to use that region’s call processor), you should always
configure a route, on the region, to the region itself. For example, R2a
could have a route to R1a set up as a Redirect Call Processor type to
forward calls to R2a destined for another location. R2a should also
have a route to itself set up as a Call Processor type to accept calls to
R2a.
Once complete these steps, users can place calls between the regional
offices. If you have branch offices, you must configure routes between
the regional offices and their branch offices. See Configuring Routes on a
Branch Office and Configuring a Route from a Regional Office to a
Branch Office.
To enable user access to IP Messaging services, see Route Configuration
for Voicemail and Music on Hold.
Configuring Routes on a Branch Office
In a multi-site system that includes branch offices, each branch must
include a route to its regional call processor. This enables branch users to
make calls to destinations outside of the branch, including calls to users
at the regional office, at other regional offices, at other branch offices
and to users on the PSTN.
Branch office users may also call users on the PSTN through a media
gateway located at the branch office (for example, if the branch office
has a 3Com V6000 Branch Office Gateway system).