Provides 8 ISDN S-interface device lines to the desktop. Avaya IP400 So8 module provides 8 ISDN BRI lines to the desktop. Used to connect ISDN devices, such as video-conferencing systems or a credit card reader with high speed connection. The IP Office So8 expansion module supports both point-to-point and point-to-multipoint connections. A maximum of 10 terminal endpoints identifiers (TEIs) are supported. Require 1 rack mount kit and 1 power lead.