The STIR/SHAKEN ANI verification is being rolled out by all carriers in North America. I do not see any documentation from ADTRAN saying that they support this CRTC and FCC mandated technology. I have legacy Netvanta 644's and Total Access 900e's deployed in my network. I cannot find any ADTRAN documentation on support of STIR/SHAKEN for these products or any other ADTRAN products.
ADTRAN is aware of this technology. From what I understand, STIR/SHAKEN ANI verification is going to be very network specific so this will depend on how the provider chooses to implement it. I am sorry that I do not have any more details at this time.