Mitel MiVOICE BUSINESS, Engineering Manualline

Page: 32 / 381

Engineering Guidelines
18
TYPICAL INSTALLATION CONFIGURATIONS
The MiVoice Business platorm can be designed into different network configurations to suit the
organization of the enterprise. See the following examples for an illustration of how the
organization of the enterprise affects the overall network and unit configurations:
• “Multiple Units System” on page 18
• “Distributed System” on page 18
• “Hybrid System” on page 19
In the descriptions below, a unit is considered to be a 3300 ICP with a particular configuration
and is part of the overall telephony system.
MULTIPLE UNITS SYSTEM
In a multiple unit configuration, a number of units are clustered together, but each unit functions
independently. The units connect to each other through the network, using IP trunks or TDM
trunks. In the event of a unit failure, some of the overall system will fail. In the event of a network
failure, the units still maintain PSTN access. In a small- or medium-sized office, a number of
units could be installed together to make a larger system. Another scenario could be a small-
or medium-sized business with a number of branch offices (for example, an automobile
dealership), where local access is needed, but intershop traffic is also a requirement.
Figure 2: Example of a Multiple Units Configuration
DISTRIBUTED SYSTEM
In a distributed system, different telephony system functions are dedicated to individual units.
These are then distributed to different parts of the network, or business as required. This may
be a large and geographically dispersed enterprise. For example, a number of units could act
purely as TDM gateways providing central access, with other units acting as central voice mail
and others acting as the group controllers (a group controller is a 3300 ICP to which a group
of IP phones have been registered). An example is a university campus where each building
possesses the group controller and local phones, but the PSTN access is in a separate secure
building. A different scenario is a large enterprise with corporate headquarters in different cities.