does anyone know what the Radio Shack catalog no. 43.338 is...? It was sold Jan of 2011. All the receipt says is RADIOSHACK DECT 2-LINE. The price was 137.99. I am trying to figure out if it had a TAD, and was it expandable. I work for a franchise Radio Shack for several years now and am trying solve a customers problem without having the alleged source of the problem in front of me.