Mitel 5560 IPT none Specifications download pdf (Page 152)

Engineering Guidelines

138

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.

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Mitel 5560 IPT none Specifications Page 152