Being the Avaya Red fanboy that I am, I am always happy to see any phones from the legacy AT&T/Bell System days. As I have stated before, this vendor had 90%+ of the Fortune 500 and then lost it entirely with a company with legacy roots that was 125 years old.
Taken in October of 2017, I am unable to tell what set this is, it could be a 1416 or a 1616. The second digit model numbers what type of signaling it does to make them ether be a “telephone” or a “terminal”. Please read the section on “voice terminals” to remind yourself why your desk phone is not actually that…