I own an old TIE system. It is an ULTRACOM AT (UMT-64) model. I have 2 models of telephone sets: UAT-64E (P/N 10864E) and UAT-64 (P/N 10864). I need a Printed Circuit Board for them. I am not sure what the part number is, it shows the following identification: C-ANU-B and under this ID it reads: MH-2964(2).

Is this description sufficient to know what I need? Where can I buy this kind of parts?

>>I need a Printed Circuit Board for them.

Are you looking for the circuit cards that's inside the phone? If so you'll be better off trying to just get the phone, with something that old parts just aren't found, or you'll waste your time trying to find em.

Test-ok is right. If you do find parts don't be surprised if you pay a fortune for then. I would get refurbished, at least that way you get the whole phone.