Line Interface Module - Mitel 3300 General Information Manual

3300 ICP General Information Guide

Line Interface Module

Mitel's Line Interface Module for the 5224 and 5235 IP Phones:
• Enables incoming and outgoing analog PSTN calls directly from an IP phone
• Supports survivability (failover) in the event IP connection is lost
• Provides Emergency dialing support, for phones such that emergency calls connect through
the analog PSTN connection
The patented Line Interface Module enhances the Teleworker solution, and extends Mitel's
resiliency strategy for IP communications from the core of the network to the desktop.The Line
Interface Module allows users to make and receive calls in the event of interrupted ethernet
service or catastrophic LAN or ICP failure and provides automatic failover of voice
communication without interruption of voice services.
The Line Interface Module provides a means to connect a 5224 or 5235 IP Phone directly to
an analog line (PSTN trunk) in order to make and receive calls. It is a convenient solution that
enables remote workers to have local breakout capability and can be used to access local
emergency services. The Line Interface Module provides convergence reassurance for IP
phones in the event of a service disruption or an IP network (LAN) failure.
The module:
• Allows a user to select a PSTN line to make and receive phone calls on an analog line
without disconnecting from the IP connection.
• Provides support for system failure switchover mode. If the Ethernet connection to the
phone fails, the phone connects to an analog line to allow the business to still make and
receive calls.
• When the module is installed in the phone, allows users to access local emergency services
The Line Interface Module has two different modes of operation: LIM Mode and Failover Only
Mode. These modes are determined by the System Administrator.
• LIM Mode (recommended for Teleworker/Remote configurations) allows the user to select
an external analog line via a line key programmed on the 5224 or 5235 IP phones. The
analog line can be used at any time.
• Failover Mode, where you can use the Line Interface Module line only when the IP con-
nection has failed. In Failover Mode, if the phone does not receive a response to 'keep
alive' messages, the phone assumes the Ethernet link is down and automatically switches
to analog mode.
The 3300 ICP Release 6.0 supports Emergency Call Routing for Teleworker phones with the
Line Interface Module. To make use of Emergency Call Routing, the system administrator must
program Emergency Call Routing information in the 3300 ICP once the Line Interface Module
is configured. For more information on Emergency Call Routing, refer to "Emergency services
support" on page 63.
In addition, for Release 6.0, Teleworker sets with Line Interface Modules support emergency
call response from the local Public Safety Answering Point (PSAP).
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