Getting Started
Using the Line Interface Module (LIM)
The LIM is an optional device that adds an analog phone line capability to your IP phone. In the event of a network failure, the IP phone can be configured to use the public switched telephone network (PSTN) to provide continued basic telephony until service in restored. The analog line can also be used for emergency calls and local calling.
Line Interface Module
Ethernet
ConnectionAnalog PSTN
Connection
You can use the LIM to:
•allow incoming and outgoing analog PSTN calls directly to and from the IP phone
•provide survivability (failover) in the event IP connectivity is lost
•provide emergency dialing support (emergency calls can be programmed to connect through the analog PSTN connection)
If you have a LIM connected to your IP phone, all programming of the LIM, except the Analog button (key), is done by the Installer when your IP phone is installed. To program the Analog button, see “Using Programmable Buttons” on page 24.
The LIM operates in one of the following two modes, as determined by your System Administrator:
•LIM Mode: You can use the LIM line at any time.
•Failover Mode: You can use the LIM line only when the IP connection has failed.
Note: Handsfree and
For information on emergency number dialing using the LIM, see “Placing Emergency Calls using the LIM Line” on page 33.
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