I’m a voice talent and I need help from someone who has experience setting up Musicam CDQ 1000 ISDN codec. It’s an older legacy model which I was able to obtain second hand at a very reasonable price for my new BRI ISDN line. But I am stuck now. There is little support for this model in terms of what interface I need for it. I think I need some kind of terminal adapter or LT-1 or both. I was thinking that Adtran ATLAS 550 might be the interface I need. I am not very technical but I learn fast. I would really very much appreciate any, preferably unambiguous, information on how to connect my codec to the ISDN jack.