Mitel MiVOICE BUSINESS, Engineering Manualline

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System Overview
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SYSTEM ARCHITECTURE
The 3300 ICP is built upon Mitel’s Data Integrated Voice Applications™ architecture delivering
sophisticated call management, applications and desktop solutions to businesses. Mitel
delivers a highly scalable, resilient, and robust call control that fully utilizes the power of IP
while fully supporting the traditional TDM-based telephony for legacy devices and PSTN
connectivity.
Mitel’s architecture uses the IP network to connect IP telephony devices and provides a
supplementary TDM (time division multiplexing) subsystem to switch calls between traditional
telephone devices (Figure 1). The 3300 ICP has the advantage of being able to optimally switch
both types of traffic, IP or TDM. The 3300 ICP provides native call setup, tear down, and
signalling between Ethernet IP-connected telephones. For traditional telephony, such as POTS
and PSTN trunks, call handling is also handled natively by the 3300 ICP through a conventional
TDM circuit-switched subsystem.
This ability to use two different switching techniques simultaneously means that
• All traffic is switched with minimum conversion between packet and traditional telephony
to provide optimum voice quality in all call scenarios.
• Embedded gateway functionality is required only between the IP and non-IP networks
optimizing the use of system resources.
• Migration from traditional PBX to IP telephony is seamless and efficient.
Figure 1: 3300 ICP System Architecture