It needs the port card jacks on the back to be connected to single line ports on the Legend. 012TR, 016TR, oo8OPT, or the last 6 ports on a 016ETR card. If I recall correctly, each port on the Audix take in 2 or maybe 3 stations. Assign these to a calling group (usually 770) set up as Linear and covering for cover group 30. Put your users ext. no. into cover group 30 and start programming the Audix. That's where I fall down. Haven't done a lot of programming on Audix, only trouble calls, no setup. It is getting long in the tooth.