I am looking for a Comdial DX-80 expansion KSU but having a hard time finding it. Can I use the the DX-120 expansion unit on the DX-80? Does anyone know where I can buy a DX-80 expansion unit?

https://www.sundance-communications.com/forum/ultimatebb.php?/ubb/get_topic/f/2/t/001722.html

This was discussed in the thread above.

Thank You!!