Mitel MiVOICE BUSINESS, Engineering Manualline

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Engineering Guidelines
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CLUSTERING
Clustering and networking between units introduces additional performance overhead and
limitations on the individual 3300 ICPs and MiVoice Business systems, but allows a much
greater overall system to be deployed, over potentially a large geographic area. To determine
the impact of such configurations and use with users and applications, it is highly recommended
to use the System Engineering Tool to gauge the headroom and overall impact of such
configurations.
Within the System Engineering Tool a number of system configurations are highlighted. These
are described in detail within the instructions associated with the System Engineering Tool, but
are described briefly here:
• Standalone: An individual unit that is not connected by any form of networking, for example,
a small or medium-sized business.
• Networked: A number of locations that are interconnected, but the level of inter-office traffic
is not particularly high, for example, a business with multiple corporate offices in different
cities.
• Clustered (with PSTN trunk sharing): A number of systems that interoperate to create a
bigger system; for example, a larger office where there are a number of trunk connections
to the PSTN, but where the PSTN can present a call to any of the trunks. An incoming call
could arrive on any system, and likewise on outgoing call could also go through any system.
• Clustered (without PSTN trunk sharing): A business that is connected using a MAN
(perhaps dispersed across a city) where each office is connected to the PSTN through local
trunks, but where internal traffic can flow freely from office to office. Examples include a
campus environment, a large department chain, or a government establishment.
• User Controller: This is a 3300ICP or MiVoice Business system that only deals with IP
Phones and users. It does not have direct connectivity to TDM PSTN trunks, although it
will have access to IP-Trunks to other MiVoice Business systems and 3300ICPs. A user
controller connected via SIP trunks could also be modeled by a standalone configuration.
• Trunking Gateway PSTN/TDM: This is a 3300ICP that is primarily a tandem controller that
interfaces IP-Trunks to PSTN/TDM trunks, or analogue phones. Typically such a unit will
not have associated IP users, but it may have associated applications for call handling or
queuing, for example with call centres.
• Trunking gateway PSTN/SIP: This is a 3300ICP or MiVoice Business system that is pri-
marily a tandem controller that interfaces between internal IP-Trunks and external SIP
trunks. Typically such a unit will not have associated users, but it may have associated
application for call handling or queuing, for example with call centres.