Avaya Nortel Communication Server 1000 Reference page 243

Applications
Figure 69: LEI in off-premise extension application
Similarly, use the LEI to provide a connection between the system and a remote Norstar
system. See Figure 70: LEI connection to Norstar system on page 243. In this case, channel
banks are not required if the Norstar system is equipped with an E1 interface.
Note:
Consider LEI audio levels when determining the appropriateness of an application.
Figure 70: LEI connection to Norstar system
Circuit Card Reference July 2011 243