Norstar NT7B75AAAC Caller ID Analog Trunk Cartridge. The NT7B75AAA(x) series of cards came in many versions starting with AAAC and ending with AAAJ when discontinued, but they all work exactly the same.
4 Analog CO Lines
Detects and translates incoming CMS/CLASS information for display on Norstar sets
- Modular ICS Core (MICS)
- Compact ICS Core (CICS)
- Fiber and Copper Trunk Modules
- Modular 8x24 Copper Trunk Module