You need to be careful , in essence the card will not be supported , but lets say after you insert the card you start having issues with the gateway.....could be a day or could be months , but at that point Avaya could argue that the card was defective and has manifested further issues with the gateway , my advice would be just for the sake of saving a few quid or dollars dont take the risk.
ACSS (UC/SBCE/SM/SME)
Not that they mean a thing anymore , get a brain dump pass the test crash the system.