Nortel CI 4X0 Trunk card w/Caller ID

The CI trunk cartridge is a loop start, analog trunk cartridge with the capability to detect and translate incoming CMS/CLASS information from the central office for display and use on Norstar station sets. It supports disconnect supervision, and provides access for up to 4 central office lines. This trunk cartridge is compatible with the Compact ICS, and Modular 8x24 (Release DR5 or higher). It may be inserted into the Compact ICS core trunk slots, the Modular ICS core trunk slots, the Copper Trunk Module or the Fiber Trunk Module.