Yup, that's a Northern Telecom 'Nortel' system.
I think it's a "compact 6x16", with 'DR 5' software.
To the best of my knowledge, the 6x16 does not support CallerID directly. There _may_ be an add-on hardware box which provides the functionality.
On the slightly bigger boxes, to wit, the 'compact ICS'(CICS) and/or 'modular ICS' (MICS), you have to have different cards for the telco interface side to get CID info in to the box. with the 6x16, everything is built onto the motherboard, and 'what you have is what you get'.
I have a _vague_ recollection of an outboard box that did CID decoding/capture for a 6x16, but the 6x16 I ran was replaced by a MICS in the previous millenium. And, oddly enough, I haven't paid much attention to current 6x16 offerings. :)