DSX-40 is a compact, wall-mountable, more economical
member of the DSX family that offers many of the 
 features and options of the larger DSX-80/160 in a smaller,
self-contained cabinet. In its off-the-shelf basic 
configuration, DSX-40 supports 4 CO (outside)
lines with Caller ID, 8 DSX digital keyset extensions,
and 2 analog (single line) extensions with power failure.